update docs

Author: jreback

doc/source/whatsnew/v0.20.0.txt

@@ -1023,7 +1023,7 @@ If indicated, a deprecation warning will be issued if you reference that module.
     "pandas.hashtable", "pandas._libs.hashtable", ""
     "pandas.json", "pandas.io.json.libjson", "X"
     "pandas.parser", "pandas.io.libparsers", "X"
-    "pandas.types", "pandas.core.types", ""
+    "pandas.types", "pandas.core.typed", ""
     "pandas.io.sas.saslib", "pandas.io.sas.libsas", ""
     "pandas._testing", "pandas.util.libtesting", ""
     "pandas._sparse", "pandas.sparse.libsparse", ""