doc: Small wording improvement

Replace "checkpoint segment" with "WAL segment".

Reported-by: Maksim Milyutin <[email protected]>

Branch
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master

Details
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https://git.postgresql.org/pg/commitdiff/7726147f5368e04d0b7c1ab1849a6be47391ff24

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

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