[3.13] gh-134789: Document del s[i] operation for mutable sequences (GH-134804) (#134809)

gh-134789: Document del s[i] operation for mutable sequences (GH-134804)

[main] Update stdtypes.rst

- Added explicit mention of `del s[i]` (item deletion by index) to the Mutable Sequence Types section.
- Clarified that this operation removes the item at the specified index from the sequence.
- Addresses issue GH-134789.
(cherry picked from commit 967f361)

Co-authored-by: Rishabh Singh <67859818+rishabh11336@users.noreply.github.com>

Author: miss-islington

Doc/library/stdtypes.rst

@@ -1172,6 +1172,8 @@ accepts integers that meet the value restriction ``0 <= x <= 255``).
 | ``s[i] = x``                 | item *i* of *s* is replaced by |                     |
 |                              | *x*                            |                     |
 +------------------------------+--------------------------------+---------------------+
+| ``del s[i]``                 | removes item *i* of *s*        |                     |
++------------------------------+--------------------------------+---------------------+
 | ``s[i:j] = t``               | slice of *s* from *i* to *j*   |                     |
 |                              | is replaced by the contents of |                     |
 |                              | the iterable *t*               |                     |