feat(cli): rewrite cli instructions to be more succinct about what th…

[alecgerona]

Closes #258

Description

Rewrite cli instructions to be more succinct about what they require.

Checklist

• Add test cases to all the changes you introduce
• Run ./script/format and ./script/test locally to ensure this change passes linter check and test
• Test the changes on the local machine manually
• Update the documentation for the changes

Expected behavior

Steps to Test This Pull Request

1.Run cz c and view messages.

[codecov]

Codecov Report

Merging #259 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #259   +/-   ##
=======================================
  Coverage   96.61%   96.61%           
=======================================
  Files          33       33           
  Lines         915      915           
=======================================
  Hits          884      884           
  Misses         31       31           

Flag	Coverage Δ
#unittests	96.61% <ø> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
...en/cz/conventional_commits/conventional_commits.py	98.41% <ø> (ø)

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[Lee-W]

LGTM.