Update Doc/library/importlib.rst

Co-authored-by: Brett Cannon <brett@python.org>

Author: kj7rrv

Doc/library/importlib.rst

@@ -124,10 +124,9 @@ Functions
     need to call :func:`invalidate_caches` in order for the new module to be
     noticed by the import system.
 
-    If the module cannot be imported, :func:`import_module` will raise an
-    :exc:`ImportError`. If the module is found and loaded, but the code in the
-    module raises an exception, :func:`import_module` will pass that exception
-    to the module that called it.
+    If the module cannot be imported, :func:`import_module` will raise
+    :exc:`ImportError` or an appropriate subclass like
+    :exc:`ModuleNotFoundError`.
 
     .. versionchanged:: 3.3
        Parent packages are automatically imported.