Update about-campus-advisors.md

[bassa846]

@jen-k @dgyani

Why: Updating new content for the About GitHub Education Doc landing page

What's being changed: Moved a few sentences that speaks about the Campus Advisors program over to the Campus Advisors landing page. It was currently sitting under the "General GitHub Education Page".

Check off the following:

• All of the tests are passing.
• I have reviewed my changes in staging. (look for the deploy-to-heroku link in your pull request, then click View deployment)
• For content changes, I have reviewed the localization checklist
• For content changes, I have reviewed the Content style guide for GitHub Docs.

[github-actions]

This PR is stale because it has been open 7 days with no activity and will be automatically closed in 3 days. To keep this PR open, update the PR by adding a comment or pushing a commit.

[github-actions]

This PR is stale because it has been open 7 days with no activity and will be automatically closed in 3 days. To keep this PR open, update the PR by adding a comment or pushing a commit.

[hubwriter]

@bassa846 - Thank you for contributing to the GitHub documentation. You've raised 3 PRs to change 3 files:

• PR 2172: changes "About GitHub Education"
• PR 2171 changes: "About Campus Experts"
• This PR changes: "About Campus Advisors"

As these are all part of the same piece of work I've merged this PR into 2172 so that we can deal with this in one place, and merge all of these changes at the same time. I'm going to close this PR as a result.

Thanks again.