[Pig Wiki] Update of "HowToRelease" by AlanGates

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The "HowToRelease" page has been changed by AlanGates.
http://wiki.apache.org/pig/HowToRelease?action=diff&rev1=14&rev2=15

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  ant -Djava5.home=<java5 jdk dir>  -Dforrest.home=<forrest installation dir> releaseaudit >out
  }}}
   2. For patches, update CHANGES.txt to include the release version and date. See #2 from Create Release Branch section.
-  3. Update RELEASE_NOTES.txt with release notes for this release. 
+  3. Update RELEASE_NOTES.txt for this release:
+    a. Make sure to change all of the version number references to the current version number.
+    a. Note highlights for this release.  CHANGES.txt is a great place to find these.
+    a. Note incompatibilities for this release.  These should be listed under INCOMPATIBLE CHANGES in CHANGES.txt.
   4. Update the version number in `build.xml` to be X.Y.N-dev, where N is one greater than the release being made. 
   5. Commit these changes:{{{
  svn commit -m "Preparing for release X.Y.Z"