pgsql: doc: Mention NO DEPENDS ON EXTENSION in its supported ALTER comm

doc: Mention NO DEPENDS ON EXTENSION in its supported ALTER commands

This grammar flavor has been added by 5fc7039.

Author: Ian Lawrence Barwick
Discussion: /messages/by-id/CAB8KJ=ii6JScodxkA6-DO8bjatsMYU3OcewnL0mdN9geR+tTaw@mail.gmail.com
Backpatch-through: 13

Branch
------
REL_13_STABLE

Details
-------
https://git.postgresql.org/pg/commitdiff/bcd5e95754bff330151dacbf7db5140d01aabe3a

Modified Files
--------------
doc/src/sgml/ref/alter_index.sgml | 2 +-
doc/src/sgml/ref/alter_materialized_view.sgml | 2 +-
doc/src/sgml/ref/alter_procedure.sgml | 2 +-
doc/src/sgml/ref/alter_routine.sgml | 2 +-
4 files changed, 4 insertions(+), 4 deletions(-)