Several documentation pages have been removed lately.
Indeed it holds more adavanced functional or technical
flows and less basic pages. eLearning notably is more used.
A link to SMS documentation is still present in base_setup
but related documentation has been removed so it is leading
to `404 Not Found`.
This commit fixes the issue by removing the broken help link from
settings.
taskID-2489666
closesodoo/odoo#68532
X-original-commit: 3b3581c3e600c38318403543cae2f8d0c9ac5673
Signed-off-by: Thibault Delavallee (tde) <tde@openerp.com>