pg_upgrade: update C comments about pg_dumpall

Bruce Momjian <bruce@momjian.us>

Commit: 4dc3df9d193838060ec97dd29899e33676796ab5
Author: Bruce Momjian <bruce@momjian.us>
Date: 2014-06-30T23:57:47Z
Releases: 9.4.0
pg_upgrade:  update C comments about pg_dumpall

There were some C comments that hadn't been updated from the switch of
using only pg_dumpall to using pg_dump and pg_dumpall, so update them.
Also, don't bother using --schema-only for pg_dumpall --globals-only.

Backpatch through 9.4

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