doc: Add missing parenthesis to keycombo

The SIGINT keycombo for the pg_waldump stats emission was lacking a
closing parenthesis.  Backpatch to 15 where this feature was added.

Discussion: https://postgr.es/m/[email protected]
Backpatch-through: 15

Branch
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REL_15_STABLE

Details
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https://git.postgresql.org/pg/commitdiff/207fc754664492e3b61f18946bc3720db9781681

Modified Files
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doc/src/sgml/ref/pg_waldump.sgml | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

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