Cleanup on the Hadoop page
Cleanup on the Hadoop page

* Removed an unrelated reference to HADOOP-10903. The issue describes the 
  addition of the --glob flag to the hadoop command. It does not give any 
  context on why this is necessary. In fact, I failed to find any JVM reference 
  other than this SO answer: https://stackoverflow.com/a/9322747/262432.
* ${} are now used consistently in Bash snippets.
tensorflow/docs,tensorflow/docs-l10n,tensorflow/docs,tensorflow/docs