[Lucene-java Wiki] Trivial Update of "HowToContribute" by DoronCohen

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The following page has been changed by DoronCohen:
http://wiki.apache.org/lucene-java/HowToContribute

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   * comment out code that is now obsolete: just remove it.  
   * insert comments around each change, marking the change: folks can use subversion to figure out what's changed and by whom.
   * make things public which are not required by end users.
-  * Add @author tags to your code.  Give yourself credit in the CHANGES.txt file.
+  * Add @author tags to your code.  (Instead, give yourself credit in the CHANGES.txt file.)
  
  Please do:
   * try to adhere to the coding style of files you edit;