DOC-2411: TinyMCE 7.1.1 Release Notes and Changelog.

[FarzadHayat]

Ticket: DOC-2411

Site: Staging branch

Changes:

• DOC-2411: 7.1.1 Release Notes template outline

Pre-checks:

• [x] Branch prefixed with feature/<version>/, hotfix/<version>/, staging/<version>/, or release/<version>/
• [x] modules/ROOT/nav.adoc has been updated (if applicable)
• [x] Files has been included where required (if applicable)
• [x] Files removed have been deleted, not just excluded from the build (if applicable)
• [x] Files added for New product features, and included a release note entry.
• [x] Fix merge conflict in release-notes.adoc after TinyMCE 7.1 is released.
• [x] Fix merge conflict in nav.adoc after TinyMCE 7.1 is released.
• [x] Update changelog.adoc to include 7.1.1 entries.
• [ ] Re-update changelog.adoc after missing tickets have been backported.

Review:

• [ ] Documentation Team Lead has reviewed