DOC-1758: release-notes5106.md & fullscreen.md

[brian-forte]

Added complete draft of the 5.10.6 release notes as new file release-notes5106.md.

Also added NOTE admonition to fullscreen.md regarding change to this plugin introduced with the 5.10.6 update.

Related Ticket:

Description of Changes:

• 5.10.6 Release notes (and a small edit tofullscreen.md).

Pre-checks:

• [ ] Branch prefixed with feature/6/ or hotfix/6/
• [ ] modules/ROOT/nav.adoc has been updated (if applicable)
• [ ] Files has been included where required (if applicable)
• [ ] Files removed have been deleted, not just excluded from the build (if applicable)
• [ ] (New product features only) Release Note added

Review:

• [ ] Documentation Team Lead has reviewed

[brian-forte]

You also need to add this to the nav

Done.

[lnewson]

You probably also need to update the titles/descriptions of these PRs given the changes @brian-forte.

[brian-forte]

You probably also need to update the titles/descriptions of these PRs given the changes

Done.