fix(docs): Fix issue_8945 hack for Sphinx 4.0

Documentation/conf.py

@@ -167,7 +167,10 @@ def fix_issue_8945():
         "_Complex",
         "complex",
     ]:
-        c_domain._keywords.remove(kw)
+        if kw in c_domain._keywords:
+            c_domain._keywords.remove(kw)
+        if hasattr(c_domain, "_macroKeywords") and kw in c_domain._macroKeywords:
+            c_domain._macroKeywords.remove(kw)
 
     def parse_xref_object(self):
         name = self._parse_nested_name()