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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master

Details
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https://git.postgresql.org/pg/commitdiff/03e9b958eef44046c0092f1f34da4b2de0f9071d

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

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