docs updates, inc. sort extension

[philvarner]

DRAFT waiting on formatting PR to go in

Related Issue(s): #154

Description:

• add docs for Sort Extension usage
• fix code example that used old API class instead of Client
• general wordsmithing

PR Checklist:

• Code is formatted
• Tests pass
• Changes are added to the CHANGELOG

[codecov-commenter]

Codecov Report

Merging #188 (6b6a876) into main (2324110) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main     #188   +/-   ##
=======================================
  Coverage   82.57%   82.57%           
=======================================
  Files           9        9           
  Lines         597      597           
=======================================
  Hits          493      493           
  Misses        104      104           

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