Add details.rst for c-extension-no-member (#9933)

Add skeleton explanation for `typevar-name-incorrect-variance` Closes #5953
pylint-dev · Sep 18, 2024 · 3b4a7f9 · 3b4a7f9
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diff --git a/doc/data/messages/c/c-extension-no-member/details.rst b/doc/data/messages/c/c-extension-no-member/details.rst
@@ -1 +1,4 @@
-You can help us make the doc better `by contributing <https://github.com/pylint-dev/pylint/issues/5953>`_ !
+``c-extension-no-member`` is an informational variant of ``no-member`` to encourage
+allowing introspection of C extensions as described in the
+`page <https://pylint.readthedocs.io/en/latest/user_guide/messages/error/no-member.html>`_
+for ``no-member``.
diff --git a/doc/data/messages/t/typevar-name-incorrect-variance/details.rst b/doc/data/messages/t/typevar-name-incorrect-variance/details.rst
@@ -0,0 +1 @@
+When naming type vars, only use a ``_co`` suffix when indicating covariance or ``_contra`` when indicating contravariance.