pgsql: doc: Fix figures in example description

doc: Fix figures in example description

oversight in 244c8b466a743d1ec18a7d841bf42669699b3b56

Reported-by: Blaz Merela <blaz@merela.org>

Branch
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master

Details
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https://git.postgresql.org/pg/commitdiff/53cba77b53f98255bfbba9d2612d1a5685feec52

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