doc: Add index entry for MERGE SQL command.

Back-patch to v15, where MERGE command was supported.

Author: Fujii Masao
Reviewed-by: Alvaro Herrera
Discussion: 
https://postgr.es/m/[email protected]

Branch
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REL_15_STABLE

Details
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https://git.postgresql.org/pg/commitdiff/1201e0f03872fba64db04368063fa95aedf08f78

Modified Files
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doc/src/sgml/ref/merge.sgml | 3 +++
1 file changed, 3 insertions(+)

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