RST cleanup to comply with the RST guidelines. This is required so we
can use "make test", as there are currently hundreds of errors. For now,
it is unusable because of the oldest code in this repo.
closesodoo/documentation#3581
Signed-off-by: Castillo Jonathan (jcs) <jcs@odoo.com>
The terminology did not really make sense for a lot of these sub pages.
This change should have been done long ago, but was probably delayed
because some people in Odoo call the web client the "backend", which is
really misleading.
This commit also renames the title "Reference Guides" to "Reference",
since this section does not contain any guides anyway.
Part-of: odoo/documentation#1260
