[Doc] Add missing mock import to docs `conf.py` (#6834)

.readthedocs.yaml

@@ -10,6 +10,7 @@ build:
 
 sphinx:
    configuration: docs/source/conf.py
+   fail_on_warning: true
 
 # If using Sphinx, optionally build your docs in additional formats such as PDF
 formats:

docs/source/conf.py

@@ -94,6 +94,7 @@ def setup(app):
 
 # Mock out external dependencies here, otherwise the autodoc pages may be blank.
 autodoc_mock_imports = [
+    "aiohttp",
     "cpuinfo",
     "torch",
     "transformers",
@@ -141,5 +142,6 @@ intersphinx_mapping = {
 }
 
 autodoc_preserve_defaults = True
+autodoc_warningiserror = True
 
 navigation_with_keys = False