DOC: small fix to include mention of command methods for options using collections

[bobtiernay-okta]

Small fix to include mention of command methods for options using collections.

[codecov-io]

Codecov Report

Merging #545 into master will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##             master     #545   +/-   ##
=========================================
  Coverage     89.17%   89.17%           
  Complexity      285      285           
=========================================
  Files             4        4           
  Lines          3946     3946           
  Branches        967      967           
=========================================
  Hits           3519     3519           
  Misses          213      213           
  Partials        214      214

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