doc: pg_buffercache documentation wordsmithing

A words seemed to have gone missing in the leading paragraphs.

Author: Bertrand Drouvot <bertranddrouvot...@gmail.com>
Co-authored-by: Daniel Gustafsson <dan...@yesql.se>
Discussion: 
https://postgr.es/m/agtqyzz9l0bjl...@ip-10-97-1-34.eu-west-3.compute.internal
Backpatch-through: 18

Branch
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REL_18_STABLE

Details
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https://git.postgresql.org/pg/commitdiff/87f0d3cd8db54f616d3e65f6cb6fb54428b852df

Modified Files
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doc/src/sgml/pgbuffercache.sgml | 6 +++---
1 file changed, 3 insertions(+), 3 deletions(-)

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