Fix capitalization in comment in prettyVersion().

Minor fix up to correct the capitaliztion in the example return.

Change-Id: Iff07c71692e2c22485f5435ba100b2dc92bd5153
Reviewed-on: http://review.couchbase.org/42794
Reviewed-by: Aliaksey Kandratsenka <alkondratenko@gmail.com>
Tested-by: Aliaksey Kandratsenka <alkondratenko@gmail.com>