Subject: bug#18798: ls -Rd = ls -d so maybe warn

From: 積丹尼 Dan Jacobson <[email-masked]>
Date: Thu, 23 Oct 2014 10:45:56 +0800

I was thinking maybe ls -Rd would be like ls -R, but only show
directories, not also regular files too.

I don't think any behavior should be changed. I just think some note
about that combination should be added to the docs.