Improve cbcrc/cbc-pillowfight manpages

This adds some more usage examples.

Change-Id: Ib4cc40bfdb9e693a00eb635e9de35d18d7479fe8
Reviewed-on: http://review.couchbase.org/43497
Reviewed-by: Sergey Avseyev <sergey.avseyev@gmail.com>
Tested-by: Mark Nunberg <mnunberg@haskalah.org>