doc: Fix wording of MERGE actions in README

UPDATE was listed twice and DELETE was omitted, replace one UPDATE
with DELETE instead.

Backpatch through v15 where MERGE was added.

Author: Myo Wai Thant <[email protected]>
Reviewed-by: Richard Guo <[email protected]>
Discussion: 
https://postgr.es/m/osapr01mb43247e46931e9e9cfc4aa0f29a...@osapr01mb4324.jpnprd01.prod.outlook.com
Backpatch-through: 15

Branch
------
REL_15_STABLE

Details
-------
https://git.postgresql.org/pg/commitdiff/1eaa48e998e20766d70ed80cf538f3871d1c562c

Modified Files
--------------
src/backend/executor/README | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

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