Fix remaining type-hints

Author: fournier-p

sphinx_needs/layout.py

@@ -729,7 +729,7 @@ def meta_links_all(
 
     def meta_rst(
         self, name: str, prefix: str | None = None, show_empty: bool = False
-    ) -> nodes.paragraph:
+    ) -> nodes.paragraph | list[nodes.Element]:
         """
         Returns the specific metadata of a need inside docutils nodes, parsed as multiline rst.
         Usage::