docs: maintainers_include: don't ignore invalid profile entries

docs: maintainers_include: don't ignore invalid profile entries

Currently, there is a "P" entry for Rust pin-init that is
neither a valid ReST file inside Documentation nor an URL.

A proper fix is to either convert/move the file or point to
a URL. Yet, the parser should be able to pick what's there and
show on its output.

Add a logic to produce a warning when this happens.

Message-ID: <63228e005fcf3dc4583cee06905341e8bce84181.1777987027.git.mchehab+huawei@kernel.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
Message-ID: <98915f35442fa12c6d59611083aea3adbf8c6aff.1778309595.git.mchehab+huawei@kernel.org>