Add maintainers to the admin guide

That's my third attempt to add the MAINTAINERS contents to the admin-guide.

On the past approaches, was planning to keep the documentation about what's at the MAINTAINERS file inside it, but that would require running an external script or use some Sphinx extension.

This time, I took a much simpler approach: convert the initial part of the MAINTAINERS file to ReST and move to a file at the admin-guide. So, MAINTAINERS file will now contain only the maintainer's database, and a single line pointing to its documentation.

That should hopefully be a good compromise, as we can add its contents to a Sphinx file without causing too much hasle.

Mauro Carvalho Chehab (2):
MAINTAINERS: convert first part to ReST markup
MAINTAINERS: add it to the admin-guide

 Documentation/admin-guide/index.rst       |   1 +
 Documentation/admin-guide/maintainers.rst | 184 ++++++++++++++++++++++++++++++
 MAINTAINERS                               | 125 +-------------------
 3 files changed, 187 insertions(+), 123 deletions(-)
 create mode 100644 Documentation/admin-guide/maintainers.rst

2.9.3