docs: add a title for Negated Options

[haoranpb]

It takes me a while to realize that --no-config will set the value of config to true.

So I think maybe Negated Options can have its own title in the usage

[codecov-io]

Codecov Report

Merging #63 into master will not change coverage.
The diff coverage is n/a.

@@          Coverage Diff           @@
##           master     #63   +/-   ##
======================================
  Coverage    67.3%   67.3%           
======================================
  Files           6       6           
  Lines         367     367           
  Branches       91      91           
======================================
  Hits          247     247           
  Misses        117     117           
  Partials        3       3

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🎉 This PR is included in version 6.5.6 🎉

The release is available on:

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• GitHub release

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 67.30%. Comparing base (e9ea9b7) to head (abf5885).
Report is 43 commits behind head on master.

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Additional details and impacted files

@@           Coverage Diff           @@
##           master      #63   +/-   ##
=======================================
  Coverage   67.30%   67.30%           
=======================================
  Files           6        6           
  Lines         367      367           
  Branches       91       91           
=======================================
  Hits          247      247           
  Misses        117      117           
  Partials        3        3           

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