Apply suggestions from code review

Co-authored-by: Barry Warsaw <barry@python.org>

Author: ofek

peps/pep-0752.rst

@@ -193,6 +193,10 @@ Repositories SHOULD impose a depth limit on the number of hyphens in a namespace
 For example, if the depth limit is ``1`` then the namespace ``foo-bar`` would be
 allowed but ``foo-bar-baz`` could not be granted.
 
+Policies for granting and managing namespaces are not discussed here as they are
+specific to each index. The proposed namespace policy for PyPI is described in
+:pep:`755`.
+
 .. _uploads:
 
 Uploads