[COMMITTERS] pgsql: Fix function comment for dumpACL()

Fix function comment for dumpACL()

The comment for dumpACL() got neglected when initacls and initracls were
added and the discussion of what 'racls' is wasn't very clear either.

Per complaint from Tom.

Branch
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REL9_6_STABLE

Details
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https://git.postgresql.org/pg/commitdiff/d38e706ff149eb0937502cc0be27645e70bbfec6

Modified Files
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src/bin/pg_dump/pg_dump.c | 18 ++++++++++++++----
1 file changed, 14 insertions(+), 4 deletions(-)