Example: Lint tool being used on the basic ruby section #27448

[nik-rev]

Because

This is an example of what the Lint tool can do and to demonstrate how it can fix an entire section in one command:

node ./markdowntool/markdowntool.js ./ruby/basic_ruby/

No human intervention took place.

This PR

• Fix almost all lint issues in the ruby section to give an example of the lint tool

Issue

Closes #XXXXX

Additional Information

Pull Request Requirements

• [x] I have thoroughly read and understand The Odin Project Contributing Guide
• [x] The title of this PR follows the location of change: brief description of change format, e.g. Intro to HTML and CSS lesson: Fix link text
• [x] The Because section summarizes the reason for this PR
• [x] The This PR section has a bullet point list describing the changes in this PR
• [x] If this PR addresses an open issue, it is linked in the Issue section
• [x] If any lesson files are included in this PR, they have been previewed with the Markdown preview tool to ensure it is formatted correctly
• [x] If any lesson files are included in this PR, they follow the Layout Style Guide