doc: Fix PL/pgSQL casing to be consistent

Ensure that all mentions of PL/pgSQL is cased equally, a few instances
of PL/PgSQL had snuck in.

Reviewed-by: Pavel Stehule <pavel.steh...@gmail.com>
Discussion: https://postgr.es/m/ddcf61c3-9e25-48a8-97be-6113a93d5...@yesql.se

Branch
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master

Details
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https://git.postgresql.org/pg/commitdiff/cb62d0b3c372350b997733f41283cc35a6814024

Modified Files
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doc/src/sgml/plpgsql.sgml | 8 ++++----
1 file changed, 4 insertions(+), 4 deletions(-)

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