Update SUPPORT.md

[mjang]

I'm using this template repo to create a future open source doc repo. In the SUPPORT.md file, I exposed the link to sales, as our products do have commercial support. That link is out of date, so:

Proposed changes

I've changed commented link in SUPPORT.md to F5.com sales

Checklist

Before creating a PR, run through this checklist and mark each as complete:

• I have read the contributing guidelines.
• I have signed the F5 Contributor License Agreement (CLA).
• If applicable, I have added tests that prove my fix is effective or that my feature works.
• If applicable, I have checked that any relevant tests pass after adding my changes.
• I have updated any relevant documentation (README.md and CHANGELOG.md).

[github-actions]

✅ All required contributors have signed the F5 CLA for this PR. Thank you!
_{Posted by the CLA Assistant Lite bot.}

[mjang]

I have hereby read the F5 CLA and agree to its terms

[mjang]

recheck