[3.13] gh-134833: improve docs for del s[i:j] in Mutable Sequence Types (GH-134834) (#136609)

gh-134833: improve docs for `del s[i:j]` in `Mutable Sequence Types` (GH-134834)
(cherry picked from commit 609d5ad)

Co-authored-by: Yongzi Li <[email protected]>

Author: miss-islington

Doc/library/stdtypes.rst

@@ -1181,7 +1181,9 @@ accepts integers that meet the value restriction ``0 <= x <= 255``).
 |                              | is replaced by the contents of |                     |
 |                              | the iterable *t*               |                     |
 +------------------------------+--------------------------------+---------------------+
-| ``del s[i:j]``               | same as ``s[i:j] = []``        |                     |
+| ``del s[i:j]``               | removes the elements of        |                     |
+|                              | ``s[i:j]`` from the list       |                     |
+|                              | (same as ``s[i:j] = []``)      |                     |
 +------------------------------+--------------------------------+---------------------+
 | ``s[i:j:k] = t``             | the elements of ``s[i:j:k]``   | \(1)                |
 |                              | are replaced by those of *t*   |                     |