In d46e358d3e88aea9f9289c4845c6c87ab9491c55 some mail.thread method
names were changed: it should be changed in documentation too.
closesodoo/documentation#1684
X-original-commit: b24560e224
Signed-off-by: Antoine Vandevenne (anv) <anv@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