Copy-editing of pg_verify_checksums help and ref page

Peter Eisentraut <peter_e@gmx.net>

Commit: 2d41d914ab70cfd45f89bc1fdf682144efa001b2
Author: Peter Eisentraut <peter_e@gmx.net>
Date: 2018-08-23T18:32:56Z
Releases: 12.0
Copy-editing of pg_verify_checksums help and ref page

Reformat synopsis, put options into better order, make the desciption
line a bit shorter, and put more details into the description.

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