[Nutch Wiki] Trivial Update of "HowToContribute" by SebastianNagel

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The "HowToContribute" page has been changed by SebastianNagel:
https://wiki.apache.org/nutch/HowToContribute?action=diff&rev1=8&rev2=9

Comment:
Add links how to run individual unit tests.

  }}}
  please, read carefully the errors messages and check your code.
  
+ It is possible to run individual unit tests (useful during development), see [[bin/nutch junit]] and [[WritingPluginExample-1.2#Unit_testing]].
+ 
  ==== Functional Tests ====
  
  If you are ''perfectionist'' you can also perform some functional tests by running Nutch.