Merge #75

75: Automated pull from `ferrocene/specification` r=tshepang a=github-actions[bot]

This PR pulls the following changes from the [`ferrocene/specification`](https://github.com/ferrocene/specification) repository:

* ferrocene/specification#456


Co-authored-by: Matthew Woodcraft <matthew@woodcraft.me.uk>
Co-authored-by: bors-ferrocene[bot] <87868125+bors-ferrocene[bot]@users.noreply.github.com>
Co-authored-by: github-actions[bot] <41898282+github-actions[bot]@users.noreply.github.com>

ferrocene/doc/specification/exts/ferrocene_spec/items_with_rubric.py

@@ -40,11 +40,7 @@ class RubricCollector(EnvironmentCollector):
     def clear_doc(self, app, env, docname):
         storage = get_storage(env)
         for rubric, items in storage.items():
-            # This makes a copy of the list (with `list(items)`) to be able to
-            # remove items from it without affecting the iteration.
-            for i, item in enumerate(list(items)):
-                if item.document == docname:
-                    items.pop(i)
+            items[:] = (item for item in items if item.document != docname)
 
     def merge_other(self, app, env, docnames, other):
         current = get_storage(env)