a couple more changes files issues.

changes/bug14821

   o Major bugfixes (compilation):
-    - Correctly repair hardened builds under the clang compiler. Previously,
+    - Repair hardened builds under the clang compiler. Previously,
       our use of _FORTIFY_SOURCE would conflict with clang's address
       sanitizer. Fixes bug 14821; bugfix on 0.2.5.4-alpha.

changes/bug17906

-  o Minor features (authorities):
+  o Major features (authorities):
     - Update the V3 identity key for the dannenberg authority, which changed on
       18 November 2015.
       Closes task 17906. Patch by "teor".