doc: domain: Disable warnings when board catalog not present

With the introduction of the board-catalog role in
cd6b1f5, using the Zephyr doc
infrastructure without a board catalog instantiated leads to a warning.
Avoid this by disabling the warnings for this role.

Signed-off-by: Carles Cufi <carles.cufi@nordicsemi.no>

Author: carlescufi

doc/_extensions/zephyr/domain/__init__.py

@@ -1155,7 +1155,7 @@ class ZephyrDomain(Domain):
         "code-sample": XRefRole(innernodeclass=nodes.inline, warn_dangling=True),
         "code-sample-category": XRefRole(innernodeclass=nodes.inline, warn_dangling=True),
         "board": XRefRole(innernodeclass=nodes.inline, warn_dangling=True),
-        "board-catalog": XRefRole(innernodeclass=nodes.inline, warn_dangling=True),
+        "board-catalog": XRefRole(innernodeclass=nodes.inline, warn_dangling=False),
     }
 
     directives = {