Documentation: HID: hid-transport editing & corrections

Do basic editing & correction to hid-transport.rst:
- s/responsible of/responsible for/
- fix grammar & punctuation

Signed-off-by: Randy Dunlap <rdunlap@infradead.org>
Cc: Jiri Kosina <jikos@kernel.org>
Cc: Benjamin Tissoires <benjamin.tissoires@redhat.com>
Cc: linux-input@vger.kernel.org
Cc: David Herrmann <dh.herrmann@gmail.com>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: linux-doc@vger.kernel.org
Cc: Jonathan Cameron <jic23@kernel.org>
Reviewed-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>

docs: hid: convert to ReST

Rename the HID documentation files to ReST, add an
index for them and adjust in order to produce a nice html
output via the Sphinx build system.

While here, fix the sysfs example from hid-sensor.txt, that
has a lot of "?" instead of the proper UTF-8 characters that
are produced by the tree command.

At its new index.rst, let's add a :orphan: while this is not linked to
the main index.rst file, in order to avoid build warnings.

Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>
Acked-by: Benjamin Tissoires <benjamin.tissoires@redhat.com>
Signed-off-by: Benjamin Tissoires <benjamin.tissoires@redhat.com>