LUDOC-11 cleanup: Update examples and fix typos

LUDOC-11 cleanup: Update examples and fix typos

Cleanup of examples and text in the Benchmaking Tests
section of the manual. The sample output for ost-survey
was updated and the command line flags were corrected.

For obdfilter-survey, the input parameter "target"
was changed to "targets".

Change-Id: Ib7f36ae860b6999b2a87b7e05ab8be8b0dee36ed
Signed-off-by: James Nunez <james.a.nunez@intel.com>
Reviewed-on: http://review.whamcloud.com/11976
Tested-by: Jenkins
Reviewed-by: Richard Henwood <richard.henwood@intel.com>