docs: add 'Quince' to titles

[cmltaWt0]

This adds "Quince Release" to titles in the open-release/quince.master branch as instructed by the release instructions: https://openedx.atlassian.net/wiki/spaces/COMM/pages/19662426/Process+to+Create+an+Open+edX+Release#5.-Update-the-documentation

[openedx-webhooks]

Thanks for the pull request, @cmltaWt0! Please note that it may take us up to several weeks or months to complete a review and merge your PR.

Feel free to add as much of the following information to the ticket as you can:

• supporting documentation
• Open edX discussion forum threads
• timeline information ("this must be merged by XX date", and why that is)
• partner information ("this is a course on edx.org")
• any other information that can help Product understand the context for the PR

All technical communication about the code itself will be done via the GitHub pull request interface. As a reminder, our process documentation is here.

Please let us know once your PR is ready for our review and all tests are green.

[cmltaWt0]

@kdmccormick could you review this?

[openedx-webhooks]

@cmltaWt0 🎉 Your pull request was merged! Please take a moment to answer a two question survey so we can improve your experience in the future.