Update docs/source/error_code_list2.rst: fix heading underline

wyattscarpenter · A5rocks · web-flow · commit 78af83660700 · 2025-09-25T04:37:57.000+07:00
Co-authored-by: A5rocks &lt;git@helvetica.moe&gt;
diff --git a/docs/source/error_code_list2.rst b/docs/source/error_code_list2.rst
@@ -680,7 +680,7 @@ Example:
 .. _code-untyped-decorator:
 
 Error if an untyped decorator makes a typed function effectively untyped [untyped-decorator]
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 If enabled with :option:`--disallow-untyped-decorators <mypy --disallow-untyped-decorators>`
 mypy generates an error if a typed function is wrapped by an untyped decorator
