Small improvements on the README

[rdleon]

Description

Some small improvements for readability and clarity on the README.

Fixes # (issue)

Type of change

Please delete options that are not relevant.

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update

How Has This Been Tested?

There's only documentation in this PR, a review should be enough testing.

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• I have checked my code and corrected any misspellings

[danvergara]

The README.md file isn't the only documentation source available. Please, add the necessary changes to the files inside docs/, since we use mkdocs for the website .

[danvergara]

This is the output generated by Cobra when the user adds the -h flag to the cli. I suggest to add these changes to the cmd/root.go file