gh-92994: Clarify importlib "check" example (GH-92995)

miss-islington · hauntsaninja · web-flow · commit 936eefcb820a · 2022-05-22T19:11:58.000-07:00
Fixes GH-92994 (cherry picked from commit e39cd76) Co-authored-by: Shantanu <12621235+hauntsaninja@users.noreply.github.com>
diff --git a/Doc/library/importlib.rst b/Doc/library/importlib.rst
@@ -1749,6 +1749,9 @@ Checking if a module can be imported
 
 If you need to find out if a module can be imported without actually doing the
 import, then you should use :func:`importlib.util.find_spec`.
+
+Note that if ``name`` is a submodule (contains a dot),
+:func:`importlib.util.find_spec` will import the parent module.
 ::
 
   import importlib.util
