sphinx/conf.py: Filter out all warnings related to parallel processing

Sphinx prints warnings when an extension does not declare it is safe to use
with parallel build and switch back to sequential build in that case.

Previously only parallel read warnings were filtered out so ensure parallel
write ones are also considered.

swh/docs/sphinx/conf.py

@@ -371,15 +371,19 @@ def setup(app):
     # the documentation
     os.environ["SWH_DOC_BUILD"] = "1"
 
-    # filter out parallel read in sphinx extension warnings
+    # filter out parallel read/write in sphinx extension warnings
     # to not consider them as errors when using -W option of sphinx-build
     class ParallelReadWarningFilter(logging.Filter):
         def filter(self, record: logging.LogRecord) -> bool:
             message = record.getMessage()
-            return (
-                "extension does not declare if it is safe for parallel reading"
-                not in message
-            ) and message != "doing serial read"
+            return all(
+                text not in message
+                for text in (
+                    "extension does not declare if it is safe for parallel",
+                    "extension is not safe for parallel",
+                    "doing serial",
+                )
+            )
 
     # insert a custom filter in the warning log handler of sphinx
     get_sphinx_warning_handler().filters.insert(0, ParallelReadWarningFilter())