Copy-editing of pg_verify_checksums help and ref page

Peter Eisentraut <peter_e@gmx.net>

Commit: 9126b4ee1c59ef07c55227b55c45a8d4bc6590d9
Author: Peter Eisentraut <peter_e@gmx.net>
Date: 2018-08-23T18:33:39Z
Releases: 11.0
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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