manuals: refer to new yocto-patches mailing list wherever appropriate

There's a new yocto-patches mailing list available for all layers that
do not have their own mailing list.

c.f. https://lists.yoctoproject.org/g/yocto/topic/105197684

Cc: Quentin Schulz <foss+yocto@0leil.net>
(From yocto-docs rev: ac512f76b93a20507a6835ddafa954b4ae45e268)

Signed-off-by: Quentin Schulz <quentin.schulz@theobroma-systems.com>
Reviewed-by: Michael Opdenacker <michael.opdenacker@bootlin.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

documentation/contributor-guide/submit-changes.rst

@@ -440,7 +440,7 @@ varies by component:
 
 For changes to other layers and tools hosted in the Yocto Project source
 repositories (i.e. :yocto_git:`git.yoctoproject.org <>`), use the
-:yocto_lists:`yocto </g/yocto/>` general mailing list.
+:yocto_lists:`yocto-patches </g/yocto-patches/>` general mailing list.
 
 For changes to other layers hosted in the OpenEmbedded source
 repositories (i.e. :oe_git:`git.openembedded.org <>`), use

documentation/ref-manual/resources.rst

@@ -66,6 +66,9 @@ instructions:
 -  :yocto_lists:`/g/yocto` --- general Yocto Project
    discussion mailing list.
 
+-  :yocto_lists:`/g/yocto-patches` --- patch contribution mailing list for Yocto
+   Project-related layers which do not have their own mailing list.
+
 -  :oe_lists:`/g/openembedded-core` --- discussion mailing
    list about OpenEmbedded-Core (the core metadata).