Update comments

Author: markshannon

Objects/capsule.c

@@ -287,7 +287,9 @@ static void
 capsule_dealloc(PyObject *op)
 {
     PyCapsule *capsule = _PyCapsule_CAST(op);
-    PyObject_GC_UnTrack(op);
+    if (_PyObject_GC_IS_TRACKED(op)) {
+        PyObject_GC_UnTrack(op);
+    }
     if (capsule->destructor) {
         capsule->destructor(op);
     }

Python/gc.c

@@ -2201,9 +2201,8 @@ void
 PyObject_GC_UnTrack(void *op_raw)
 {
     PyObject *op = _PyObject_CAST(op_raw);
-    /* Obscure:  the trashcan mechanism requires that we be able to
-     * call PyObject_GC_UnTrack twice on an object.
-     */
+    /* The code for some objects, such as tuples, is a bit
+     * sloppy about when the object is tracked and untracked. */
     if (_PyObject_GC_IS_TRACKED(op)) {
         _PyObject_GC_UNTRACK(op);
     }

Python/gc_free_threading.c

@@ -2500,9 +2500,8 @@ void
 PyObject_GC_UnTrack(void *op_raw)
 {
     PyObject *op = _PyObject_CAST(op_raw);
-    /* Obscure:  the trashcan mechanism requires that we be able to
-     * call PyObject_GC_UnTrack twice on an object.
-     */
+    /* The code for some objects, such as tuples, is a bit
+     * sloppy about when the object is tracked and untracked. */
     if (_PyObject_GC_IS_TRACKED(op)) {
         _PyObject_GC_UNTRACK(op);
     }