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

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The "HowToContribute" page has been changed by ErickErickson.
The comment on this change is: Added note about ant spurious error about "bad path element".
http://wiki.apache.org/solr/HowToContribute?action=diff&rev1=49&rev2=50

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  {{{
  BUILD SUCCESSFUL
  }}}
- all is ok, but if you see
+ all is ok, even if you see some lines like this during the build.
+ {{{
+ > [javac] warning: [path] bad path element "blahblahblah\activation.jar": no such file or directory
+ }}}
+ There's a bug in ant that generates these, they're harmless. If the "BUILD SUCCESSFUL" message is printed, 
+ 
+ but if you see
  
  {{{
  BUILD FAILED
  }}}
+ 
  please, read carefully the errors messages and check your code. If the test fails you may want to repeatedly rerun a single test as you debug and sort out any problems. In which case you could run
  
  {{{