Make sys.lazy_modules match PEP and keep internal lazy submodules tracking internal

Author: DinoV

Include/internal/pycore_interp_structs.h

@@ -353,10 +353,9 @@ struct _import_state {
     // lazily imported. This value is only for debugging/introspection
     // purposes and is not used by the runtime.
     PyObject *lazy_modules;
-    // A dict mapping package names to a set of submodule names that
-    // have been imported lazily from packages which have been imported
-    // lazily. When the package is reified we need to add a
-    // LazyImportObject which refers to the submodule on the module.
+    // Submodules that have been imported lazily from modules which have
+    // been imported lazily. When the module is imported we need to add
+    // a LazyImportObject which refers to the submodule on the module.
     PyObject *lazy_pending_submodules;
 #ifdef Py_GIL_DISABLED
     PyMutex lazy_mutex;