[Hadoop Wiki] Trivial Update of "GitAndHadoop" by SteveLoughran

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The "GitAndHadoop" page has been changed by SteveLoughran.
The comment on this change is: fix clean-cache description.
http://wiki.apache.org/hadoop/GitAndHadoop?action=diff&rev1=11&rev2=12

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  This Ant target not only builds the JAR files, it copies it to the local {{{${user.home}/.m2}}} directory, where it will be picked up by the "internal" resolver. You can check that this is taking place by running {{{ant ivy-report}}} on a project and seeing where it gets its dependencies.
  
- '''Warning:''' it's easy for old JAR versions to get cached and picked up. You will notice this early if something in hadoop-hdfs or hadoop-mapreduce doesn't compile, but if you are unlucky things do compile, just not work as your updates are not picked up. Run {{{ant clean-cache}} to fix this 
+ '''Warning:''' it's easy for old JAR versions to get cached and picked up. You will notice this early if something in hadoop-hdfs or hadoop-mapreduce doesn't compile, but if you are unlucky things do compile, just not work as your updates are not picked up. Run {{{ant clean-cache}}} to fix this 
  
  === Testing ===