fix: CLI to display specific command usage help

[orpheuslummis]

Relevant issue(s)

Resolves #1313

Description

Print the specific command's usage text instead of always printing root command's usage text, on user error.

Tasks

• I made sure the code is well commented, particularly hard-to-understand areas.
• I made sure the repository-held documentation is changed accordingly.
• I made sure the pull request title adheres to the conventional commit style (the subset used in the project can be found in tools/configs/chglog/config.yml).
• I made sure to discuss its limitations such as threats to validity, vulnerability to mistake and misuse, robustness to invalidation of assumptions, resource requirements, ...

How has this been tested?

manually

[codecov]

Codecov Report

Merging #1314 (651a130) into develop (01bfd49) will decrease coverage by 0.08%.
The diff coverage is 50.00%.

@@             Coverage Diff             @@
##           develop    #1314      +/-   ##
===========================================
- Coverage    70.47%   70.39%   -0.08%     
===========================================
  Files          184      184              
  Lines        17823    17823              
===========================================
- Hits         12560    12546      -14     
- Misses        4311     4320       +9     
- Partials       952      957       +5     

Impacted Files	Coverage Δ
cli/cli.go	20.93% <50.00%> (ø)

... and 6 files with indirect coverage changes

[source-devs]

Benchmark Results

Summary

• 0 Benchmarks successfully compared.
• 0 Benchmarks were ✅ Better.
• 0 Benchmarks were ❌ Worse .
• 0 Benchmarks were ✨ Unchanged.

✅ See Better Results...

	time/op		delta

❌ See Worse Results...

	time/op		delta

✨ See Unchanged Results...

	time/op		delta

🐋 See Full Results...

[AndrewSisley]

LGTM :)