Fixed typo in extending mypy docs. (#18234)

carltongibson · web-flow · commit 411e1f168e19 · 2024-12-03T09:43:18.000-08:00
diff --git a/docs/source/extending_mypy.rst b/docs/source/extending_mypy.rst
@@ -245,4 +245,4 @@ Mypy ships ``mypy.plugins.proper_plugin`` plugin which can be useful
 for plugin authors, since it finds missing ``get_proper_type()`` calls,
 which is a pretty common mistake.
 
-It is recommended to enable it is a part of your plugin's CI.
+It is recommended to enable it as a part of your plugin's CI.
