shell formatting error with the describe command, updates to the shell help text
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                 Key: HBASE-732
                 URL: https://issues.apache.org/jira/browse/HBASE-732
             Project: Hadoop HBase
          Issue Type: Bug
          Components: documentation, scripts
            Reporter: Izaak Rubin
            Priority: Minor


The formatting of the output of the shell command "describe" repeats some of 
the text.  The following is an example of the problem:

{code}
hbase(main):001:0> describe 'table2'
NAME => 'table2', FAMILIES => [{NAME => 'fam3', VERSIONS => 3, COMPRESSION => 
'NONE', IN_MEMORY => false, BLOC
KCACHE => false, LENGTH => 2147483647, TTL => FOREVER, BLOOMFILTER => NONE}, 
{NAME => 'fam2', VERSIONS => 6, COMPRESSION => 'NONE', IN_MEMORY => false, 
BLOCKCACHE => false, LENGTH => 2147483647, TTL => FOREVER, BLOOMFILT
OMPRESSION => 'NONE', IN_MEMORY => false, BLOCKCACHE => false, LENGTH => 
2147483647, TTL => FOREVER, BLOOMFILTER => NONE}, {NAME => 'fam1', VERSIONS => 
5, COMPRESSION => 'NONE', IN_MEMORY => false, BLOCKCACHE => false, LENGTH => 
2147483647, TTL => FOREVER, BLOOMFILTER => NONE}]
ER => NONE}, {NAME => 'fam1', VERSIONS => 5, COMPRESSION => 'NONE', IN_MEMORY 
=> false, BLOCKCACHE => false, LENGTH => 2147483647, TTL => FOREVER, 
BLOOMFILTER => NONE}]
ENGTH => 2147483647, TTL => FOREVER, BLOOMFILTER => NONE}]                      
                              
1 row(s) in 0.2520 seconds
{code}

In addition, my patch for this issue will include several changes to the help 
text displayed in the shell, mainly to clarify the syntax/usage of several 
commands.

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