Copy head@r302406 to stable/11 as part of the 11.0-RELEASE cycle.
Prune svn:mergeinfo from the new branch, as nothing has been merged
here.

Additional commits post-branch will follow.

Approved by: re (implicit)
Sponsored by: The FreeBSD Foundation

- Add $FreeBSD$
- Refer to the README files in the subdirs.

Clean up some of the tortured english in this file.

README reads:
This directory tree contains tools used for the maintenance of FreeBSD.
There are no Makefile structure, but possibly Makefiles in some of the
subdirs.
Nothing show be installed from here and into the running system.
This directory should contain only subdirs and this file.