gh-95191: IDLE Prompts entry for What's New 3.10 (GH-95633)

(cherry picked from commit bcc74d50)

Co-authored-by: Terry Jan Reedy <tjreedy@udel.edu>

Doc/whatsnew/3.10.rst

@@ -1186,6 +1186,9 @@ New in 3.10 maintenance releases.
 Apply syntax highlighting to `.pyi` files. (Contributed by Alex
 Waygood and Terry Jan Reedy in :issue:`45447`.)
 
+Include prompts when saving Shell with inputs and outputs.
+(Contributed by Terry Jan Reedy in :gh:`95191`.)
+
 importlib.metadata
 ------------------