[Lucy Wiki] Update of "HowToContribute" by MarvinHumphrey

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The "HowToContribute" page has been changed by MarvinHumphrey.
The comment on this change is: Remove mention of an obsolete C89 requirement..
http://wiki.apache.org/lucy/HowToContribute?action=diff&rev1=2&rev2=3

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  Modify the source code using your favorite text editor or IDE.  Please take the following points into account:
  
-  * All code will eventually need to be portable to multiple operating systems and compilers.  This is a complex requirement and it should not block your contribution, but the most helpful thing you an do up front is declare C variables at the top of each block, C89-style.
+  * All code will eventually need to be portable to multiple operating systems and compilers.  (This is a complex requirement and it should not block your contribution.)
   * All public APIs should be accompanied by informative documentation.
   * Code should be formatted according to the style guidelines at LucyStyleGuide.
   * Contributions should pass existing unit tests.