Add -r option in the custom rule script documentation
Add -r option in the custom rule script documentation

Note:
--recursive, -r       Recursively scan subfolders in a directory

Change-Id: I0c1255d250c36a9e6e6f5caeeb1d786f4c723655
Signed-off-by: George Keishing <bef0a9ecac45fb57611777c8270153994e13fd2e@in.ibm.com>

openbmc/openbmc-test-automation,openbmc/openbmc-test-automation