Add comparison level-up doc

[sooahleex]

Summary

• Add comparison level-up documentation
• Update compare command documentation to add methods

How to test

Checklist

• I have added unit tests to cover my changes.​
• I have added integration tests to cover my changes.​
• I have added the description of my changes into CHANGELOG.​
• I have updated the documentation accordingly

License

• I submit my code changes under the same MIT License that covers the project.
  Feel free to contact the maintainers if that's a concern.
• I have updated the license header for each file (see an example below).

# Copyright (C) 2023 Intel Corporation
#
# SPDX-License-Identifier: MIT

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (76d25c5) 79.94% compared to head (af8cf1c) 79.94%.

Additional details and impacted files

@@               Coverage Diff               @@
##           releases/1.5.0    #1174   +/-   ##
===============================================
  Coverage           79.94%   79.94%           
===============================================
  Files                 264      264           
  Lines               29682    29682           
  Branches             5831     5831           
===============================================
  Hits                23728    23728           
  Misses               4621     4621           
  Partials             1333     1333           

Flag	Coverage Δ
windows-2022_Python-3.8	79.94% <ø> (ø)

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[vinnamkim]

LGTM