Closes #18959: move optparse and imp to new "superseded modules" chapter
diff --git a/Doc/library/superseded.rst b/Doc/library/superseded.rst
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+.. _superseded:
+
+******************
+Superseded Modules
+******************
+
+The modules described in this chapter are deprecated and only kept for
+backwards compatibility. They have been superseded by other modules.
+
+
+.. toctree::
+
+ optparse.rst
+ imp.rst