doc:  fix plurality typo on bgwriter doc sentence

Reported-by: [email protected]

Discussion: 
https://postgr.es/m/[email protected]

Backpatch-through: 9.4

Branch
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REL_12_STABLE

Details
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https://git.postgresql.org/pg/commitdiff/f71a299c6cb87ac17b51ee1b9e389ae5a31b86fa

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

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