Minor documentation fixes

[akissa]

Before creating your Pull Request...

• New Pull Requests should include a good description of what's being merged.
• Ideally, all Pull Requests are preceded by a discussion initiated in an Issue on this repository.
• For bug fixes is mandatory to have tests that cover and fail when the bug is present and will pass after this Pull Request.
• For changes and improvements, new tests have to be provided to cover the new features.

Is this a fix, improvement or something else?

It is a fix to the documentation.

What does this change implement/fix?

Fixes minor typos in the documentation

I have ...

• answered the 2 questions above,
• [-] discussed this change in an issue,
• [-] included tests to cover this changes.

[leonelquinteros]

Thank you @akissa !!