pgsql: pg_basebackup: Add more information about --max-rate option to h

pg_basebackup: Add more information about --max-rate option to help output

It was previously not clear what unit the option argument should have.

Branch
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REL9_4_STABLE

Details
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http://git.postgresql.org/pg/commitdiff/7466037596bfdf1223f1759c7a0e4aaabff0cb53

Modified Files
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src/bin/pg_basebackup/pg_basebackup.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)

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