[Hadoop Wiki] Update of "HowToRelease" by OwenOMalley

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The "HowToRelease" page has been changed by OwenOMalley:
http://wiki.apache.org/hadoop/HowToRelease?action=diff&rev1=63&rev2=64

  svn co https://svn.apache.org/repos/asf/hadoop/common/branches/branch-X.Y
  }}}
  	1. Update {{{CHANGES.txt}}} to include the release version and date (this change must be committed to trunk and any intermediate branches between trunk and the branch being released).
- 	1. Update {{{src/docs/releasenotes.html}}} with release notes for this release. You can get the HTML by following the "Release Notes" link for the relevant release on the [[http://issues.apache.org/jira/browse/HADOOP?report=com.sourcelabs.jira.plugin.portlet.releases:releases-projecttab|Releases]] tab in Jira. 
+ 	1. Update {{{src/docs/releasenotes.html}}} with release notes for this release. You generate these with: {{{
+ cd src/docs
+ jira.sh -s https://issues.apache.org/jira -u $user -p $pw \
+    -a getIssueList --search \
+    "project in (HADOOP,HDFS,MAPREDUCE) and fixVersion = '$vers' and resolution = Fixed" \
+    | ./relnotes.py > $vers.html
+ }}} edit the releasenotes.html with the list of items from $vers.html. 
  	1. Update the version number in {{{build.xml}}} to be ''hadoop-X.Y.N-dev'', where ''N'' is one greater than the release being made.
  	1. Commit these changes. {{{
  svn commit -m "Preparing for release X.Y.Z"