move to "two people" for service support qualification

"one person outside of TPA" did not make sense for internal services,
so broaden that requirement. it's fine, anyways, if we are two to
adopt the service internally.

tsa/policy/tpa-rfc-2-support.mdwn

@@ -169,9 +169,8 @@ Services supported by TPA must fulfill the following criteria:
  4. Debian GNU/Linux is the only supported operating system, and TPA
     supports only the "stable" and "oldstable" distributions, until
     the latter becomes EOL
- 5. At least one extra person from the Tor community should be willing
-    to help to maintain the service in addition to one person from the
-    sysadmin team.
+ 5. At least two person from the Tor community should be willing
+    to help to maintain the service
 
 Note that TPA does *not* support Debian LTS.