update osx-dmg creation directions for the new methods

doc/tor-osx-dmg-creation.txt

 ## Instructions for building the official dmgs for OSX.
 ##
+## The loose table of contents:
+## Summary
+## Single Architecture Binaries for PPC or X86, not both.
+## Backwards compatible single-architecture binaries for OSX x86 10.4 from newer versions of OS X.
+## Universal Binaries for OSX PPC and X86
+## Each section is delineated by ###.
 
 The following steps are the exact steps used to produce the "official"
 OSX builds of tor.
 
-Summary:
+### Summary:
 1) Compile and install a static version of the latest release of
 libevent.
 2) Acquire and install your preferred version of tor. Extract.
 3) "make dist-osx"
 4) You now have a dmg from which you can install Tor.
 
-## Universal Binaries for OSX PPC and X86
-## This method works in OSX 10.4 (Tiger) and newer OSX versions.
-## See far below if you don't care about cross compiling for PPC and X86.
-## The single architecture process starts with "###"
+### Single Architecture Binaries for PPC or X86, not both.
+### This method works in all versions of OSX 10.3 through 10.6
+
+## Compiling libevent ##
+
+1)  Download the latest stable libevent from
+http://www.monkey.org/~provos/libevent/
+
+2) The first step of compiling libevent is to configure it as
+follows:
+       ./configure --enable-static --disable-shared
+
+3) Complete the "make" and "make install".  You will need to be root,
+or sudo -s, to complete the "make install".
+
+## Compiling Tor ##
+
+4) Get your preferred version of the tor source from https://www.torproject.org.  Extract the
+tarball.
+
+5) In the top level, this means /path/to/tor/, not tor/contrib/osx,
+do a configure with these parameters:
+     CONFDIR=/Library/Tor ./configure --prefix=/Library/Tor \
+     --bindir=/Library/Tor --sysconfdir=/Library
+
+6) In same top level dir, do a "make dist-osx".  There now exists a
+.dmg file in the same directory.  Install from this dmg.
+
+### Backwards compatible single-architecture binaries for OSX x86 10.4 from newer versions of OS X.
 
 1) Install the latest XCode updates available from http://developer.apple.com.
 
-## Compiling libevent
+## Compiling libevent ##
 
 2)  Download latest stable libevent from
 http://www.monkey.org/~provos/libevent/
 
 3) The first step of compiling libevent is to configure it as
 follows:
-CFLAGS="-O -g -mmacosx-version-min=10.4 -isysroot /Developer/SDKs/MacOSX10.4u.sdk -arch i386 -arch ppc" \
+CFLAGS="-O -g -mmacosx-version-min=10.4 -isysroot /Developer/SDKs/MacOSX10.4u.sdk -arch i386" \
 LDFLAGS="-Wl,-syslibroot,/Developer/SDKs/MacOSX10.4u.sdk" \
 ./configure --enable-static --disable-shared --disable-dependency-tracking
 
@@ -37,16 +68,14 @@ or sudo -s, to complete the "make install".
 	"file /usr/local/lib/libevent.a"
 
 	Your output should be:
-/usr/local/lib/libevent.a: Mach-O fat file with 2 architectures
 /usr/local/lib/libevent.a (for architecture i386):      current ar archive random library
-/usr/local/lib/libevent.a (for architecture ppc):       current ar archive
 
 6) Get your preferred version of the tor source from https://www.torproject.org/download.  
 Extract the tarball.
 
 7) In the top level, this means /path/to/tor/, not tor/contrib/osx,
 do a configure with these parameters:
-CFLAGS="-O -g -mmacosx-version-min=10.4 -isysroot /Developer/SDKs/MacOSX10.4u.sdk -arch i386 -arch ppc" \
+CFLAGS="-O -g -mmacosx-version-min=10.4 -isysroot /Developer/SDKs/MacOSX10.4u.sdk -arch i386" \
 LDFLAGS="-Wl,-syslibroot,/Developer/SDKs/MacOSX10.4u.sdk" \
 CONFDIR=/Library/Tor \
 ./configure --prefix=/Library/Tor --bindir=/Library/Tor \
@@ -56,39 +85,61 @@ CONFDIR=/Library/Tor \
 
 9) Confirm you have created a universal binary by issuing the follow command:
 "file src/or/tor".  Its output should be as follows:
-src/or/tor: Mach-O fat file with 2 architectures
 src/or/tor (for architecture i386):     Mach-O executable i386
-src/or/tor (for architecture ppc):      Mach-O executable ppc
 
 10) There should exist in the top-level directory a
 Tor-$VERSION-universal-Bundle.dmg
 
-11) Congrats.  You have a universal binary. You are now ready to install Tor.
+11) Congrats.  You have a backwards-compatible binary. You are now ready to install Tor.
 
-### Single Architecture Binaries for PPC or X86, not both.
-### This method works in all versions of OSX 10.3 through 10.5
+### Universal Binaries for OSX PPC and X86
+### This method works in OSX 10.4 (Tiger) and newer OSX versions.
+
+1) Install the latest XCode updates available from http://developer.apple.com.
 
-### Compiling libevent
+## Compiling libevent ##
 
-1)  Download the latest stable libevent from
+2)  Download latest stable libevent from
 http://www.monkey.org/~provos/libevent/
 
-2) The first step of compiling libevent is to configure it as
+3) The first step of compiling libevent is to configure it as
 follows:
-       ./configure --enable-static --disable-shared
+CFLAGS="-O -g -mmacosx-version-min=10.4 -isysroot /Developer/SDKs/MacOSX10.4u.sdk -arch i386 -arch ppc" \
+LDFLAGS="-Wl,-syslibroot,/Developer/SDKs/MacOSX10.4u.sdk" \
+./configure --enable-static --disable-shared --disable-dependency-tracking
 
-3) Complete the "make" and "make install".  You will need to be root,
+4) Complete the "make" and "make install".  You will need to be root,
 or sudo -s, to complete the "make install".
 
-### Compiling Tor
+5) Check for a successful universal binary of libevent.a in, by default,
+/usr/local/lib by using the following command:
+	"file /usr/local/lib/libevent.a"
 
-4) Get your preferred version of the tor source from https://www.torproject.org.  Extract the
-tarball.
+	Your output should be:
+/usr/local/lib/libevent.a: Mach-O fat file with 2 architectures
+/usr/local/lib/libevent.a (for architecture i386):      current ar archive random library
+/usr/local/lib/libevent.a (for architecture ppc):       current ar archive
 
-5) In the top level, this means /path/to/tor/, not tor/contrib/osx,
+6) Get your preferred version of the tor source from https://www.torproject.org/download.  
+Extract the tarball.
+
+7) In the top level, this means /path/to/tor/, not tor/contrib/osx,
 do a configure with these parameters:
-     CONFDIR=/Library/Tor ./configure --prefix=/Library/Tor \
-     --bindir=/Library/Tor --sysconfdir=/Library
+CFLAGS="-O -g -mmacosx-version-min=10.4 -isysroot /Developer/SDKs/MacOSX10.4u.sdk -arch i386 -arch ppc" \
+LDFLAGS="-Wl,-syslibroot,/Developer/SDKs/MacOSX10.4u.sdk" \
+CONFDIR=/Library/Tor \
+./configure --prefix=/Library/Tor --bindir=/Library/Tor \
+--sysconfdir=/Library --disable-dependency-tracking
 
-6) In same top level dir, do a "make dist-osx".  There now exists a
-.dmg file in the same directory.  Install from this dmg.
+8) "make dist-osx"
+
+9) Confirm you have created a universal binary by issuing the follow command:
+"file src/or/tor".  Its output should be as follows:
+src/or/tor: Mach-O fat file with 2 architectures
+src/or/tor (for architecture i386):     Mach-O executable i386
+src/or/tor (for architecture ppc):      Mach-O executable ppc
+
+10) There should exist in the top-level directory a
+Tor-$VERSION-universal-Bundle.dmg
+
+11) Congrats.  You have a universal binary. You are now ready to install Tor.