Grid:01-responsive-holy-grail modified README.md

[devnchill]

Because

Last two points of self check were a bit confusing.

This PR

• Modified last 2 self checks of 01-responsive-holy-grail

Issue

Closes #606

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. 01-flex-center: Update self check
• [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 applicable, I have ensured that the TOP solution files match the Desired Outcome image