docs: maintainers: add missing 's' in https for the base lore link

The example and the git hook use HTTPS but the text for some
reason links to the non-SSL version.

Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
Link: https://lore.kernel.org/r/20230713230510.1505201-1-kuba@kernel.org