[Pig Wiki] Update of "HowToRelease" by AshutoshChauhan

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The "HowToRelease" page has been changed by AshutoshChauhan.
http://wiki.apache.org/pig/HowToRelease?action=diff&rev1=28&rev2=29

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  We only branch for major (X.0.0) and minor(X.Y.0) releases but not for patches (X.Y.Z). Patch is and update to an existing branch created for X.Y.0.
  
-  1. Send email to `dev@pig.apache.com` to notify that you about to branch the tree and ask to hold off any commits till this is finished.
+  1. Send email to `dev@pig.apache.org` to notify that you about to branch the tree and ask to hold off any commits till this is finished.
   2. Update `CHANGES.txt` to include the release version and date (use `Unreleased` for the date if it is unknown) and remove `Trunk (unreleased changes)`. Below is the example of the top of the `CHANGES.txt` file after the update:{{{
  Pig Change Log