refactor(traverse): add doc comment for TraverseScoping::insert_scope_below_statements and rename var

[overlookmotel]

Follow-on after #9748. Document the TraverseScoping::insert_scope_below_statements method added in that PR. Rename a variable to a more appropriate name.

[overlookmotel]

• refactor(traverse): use ArenaBox alias #9759
• refactor(traverse): add TraverseCtx::insert_scope_below_statements #9757
• refactor(traverse): add doc comment for TraverseScoping::insert_scope_below_statements and rename var #9756 👈 (View in Graphite)
• main

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[codspeed-hq]

CodSpeed Performance Report

Merging #9756 will not alter performance

_{Comparing 03-13-refactor_traverse_add_doc_comment_for_traversescoping_insert_scope_below_statements_and_rename_var (d7dda5c) with main (43e8efd)}

Summary

✅ 33 untouched benchmarks

[graphite-app]

Merge activity

• Mar 13, 10:16 AM EDT: A user added this pull request to the Graphite merge queue.
• Mar 13, 10:22 AM EDT: A user merged this pull request with the Graphite merge queue.