[Solr Wiki] Trivial Update of "HowToContribute" by FergusMcMenemie

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The following page has been changed by FergusMcMenemie:
http://wiki.apache.org/solr/HowToContribute

The comment on the change is:
adding a bit more knowledge!

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  {{{
  BUILD FAILED
  }}}
- please, read carefully the errors messages and check your code.
+ please, read carefully the errors messages and check your code. If the test fails you may want to repeatably rerun a single test as you debug and sort out any problems. In which case you could run
+ {{{
+ > ant -Dtestcase=TestXXX test
+ }}}
+ Where "TestXXX" is the name of the particular Junit test you want to run.
  
  === Creating the patch file ===