Improve help message for quotas
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                 Key: HADOOP-6012
                 URL: https://issues.apache.org/jira/browse/HADOOP-6012
             Project: Hadoop Core
          Issue Type: Bug
    Affects Versions: 0.20.0
            Reporter: Raghu Angadi
            Priority: Minor
             Fix For: 0.20.1, 0.21.0



There are a few issues with quotas help messages.

Space Quotas :
  # It is not clear to the users that space quota counts replication as well. 
i.e. with a replication of 3, user needs 3GB of quota to be able to write 1GB 
file. should makes this explicit in the message
  # There is a cut-n-paste error in the help message.

All quota commands :
  * user needs to type {{'dfsadmin \-help \-setQuota'}} (note '\-'before 
setQuota), where as for the rest of the dfsadmin (and fs) commands '-' is not 
required. Should make this consistent.

Since this is documentation only fix, I would like to commit it to 0.20.1 also.


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