Add gRPC Python API cross referencing

Signed-off-by: Leandro Lucarella <[email protected]>

Author: llucax

mkdocs.yml

@@ -116,6 +116,7 @@ plugins:
             - https://docs.python.org/3/objects.inv
             - https://frequenz-floss.github.io/frequenz-channels-python/v0.16/objects.inv
             - https://frequenz-floss.github.io/frequenz-sdk-python/v1.0-pre/objects.inv
+            - https://grpc.github.io/grpc/python/objects.inv
             - https://typing-extensions.readthedocs.io/en/stable/objects.inv
             - https://frequenz-floss.github.io/frequenz-client-dispatch-python/v0.1/objects.inv
   # Note this plugin must be loaded after mkdocstrings to be able to use macros