Minor improvements in Incremental Sort explain

Tomas Vondra <tomas.vondra@postgresql.org>

Commit: d22782a5392f6a1cb6cfca34031b93eb9dd2aa03
Author: Tomas Vondra <tomas.vondra@postgresql.org>
Date: 2020-04-07T16:25:13Z
Releases: 13.0
Minor improvements in Incremental Sort explain

Some places still used "Maximum" instead of "Peak" when displaying info
about sort space, so fix that. Also, add a comment clarifying why it's
correct to check the number of full/prefix sort groups.

Author: James Coleman
Discussion: https://postgr.es/m/CAPpHfds1waRZ=NOmueYq0sx1ZSCnt+5QJvizT8ndT2=etZEeAQ@mail.gmail.com

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