[3.10] gh-97731: fix distclean target to clean docs GH-97732 (#97846)

Backport  gh-97731: fix distclean target to clean docs #97732 to 3.10

Makefile.pre.in

@@ -1897,8 +1897,7 @@ rmtestturds:
 	-rm -f gb-18030-2000.xml
 
 docclean:
-	-rm -rf Doc/build
-	-rm -rf Doc/tools/sphinx Doc/tools/pygments Doc/tools/docutils
+	$(MAKE) -C Doc clean
 
 # like the 'clean' target but retain the profile guided optimization (PGO)
 # data.  The PGO data is only valid if source code remains unchanged.
@@ -1942,7 +1941,7 @@ clobber: clean
 # Make things extra clean, before making a distribution:
 # remove all generated files, even Makefile[.pre]
 # Keep configure and Python-ast.[ch], it's possible they can't be generated
-distclean: clobber
+distclean: clobber docclean
 	for file in $(srcdir)/Lib/test/data/* ; do \
 	    if test "$$file" != "$(srcdir)/Lib/test/data/README"; then rm "$$file"; fi; \
 	done