Changed text on home page

[iNeso1984]

Description

changed "Sign Up For Cohort Our Next Cohort is Starting Soon! Be Sure to Sign Up to learn with us!" to Sign Up For Our Next Cohort Our Next Cohort is Starting Soon! Sign Up Now and Learn to Code!

Related Issue

https://github.com/Vets-Who-Code/vets-who-code-app/issues/350 ## Motivation and Context Improved grammar ## How Has This Been Tested? Chrome Dev Tools

Screenshots (if appropriate):

Types of changes

• [ ] Bug fix (non-breaking change which fixes an issue)
• [x ] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• [ x] My code follows the code style of this project.
• [ x] My change requires a change to the documentation.
• [ x] I have updated the documentation accordingly.
• [ ] I have read the CONTRIBUTING document.
• [ ] I have added tests to cover my changes.
• [ ] All new and existing tests passed.

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