Merge branch 'sb/t3600-rephrase' into maint

A test retitling.

* sb/t3600-rephrase:
  t3600: rename test to describe its functionality

t/t3600-rm.sh

@@ -658,7 +658,7 @@ test_expect_success 'rm of a populated nested submodule with nested untracked fi
 	test_cmp expect actual
 '
 
-test_expect_success 'rm of a populated nested submodule with a nested .git directory fails even when forced' '
+test_expect_success "rm absorbs submodule's nested .git directory" '
 	git reset --hard &&
 	git submodule update --recursive &&
 	(cd submod/subsubmod &&