OCM-6652 | task: update --best-effort help message

[thomasmckay]

https://docs.openshift.com/rosa/cli_reference/rosa_cli/rosa-manage-objects-cli.html#rosa-delete-cluster_rosa-managing-objects-cli

[ciaranRoche]

@thomasmckay task is not one of the expected key words for the commit message

These are the expected keys

feat|fix|docs|style|refactor|test|chore|build|ci|perf

[openshift-ci]

@thomasmckay: all tests passed!

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 21.45%. Comparing base (fa73f1c) to head (afda9f6).

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1840   +/-   ##
=======================================
  Coverage   21.45%   21.45%           
=======================================
  Files         113      113           
  Lines       18664    18664           
=======================================
  Hits         4005     4005           
  Misses      14351    14351           
  Partials      308      308           

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[ciaranRoche]

/lgtm

[openshift-ci]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: ciaranRoche, thomasmckay

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