docs:  fix incorrect plpgsql error message

Change "$1" to "username".

Reported-by: [email protected]

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

Backpatch-through: 12

Branch
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REL_12_STABLE

Details
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https://git.postgresql.org/pg/commitdiff/005262a03da66ab93a5ba69f0f41926e9b2e1ab6

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

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