DOC-3243: The noneditable feature can now be disabled with the new allow_noneditable option.

[kemister85]

Ticket: DOC-3243

Site: Staging

Changes:

• Added release note entry for TINY-10121 to modules/ROOT/pages/8.4.0-release-notes.adoc
• Added allow_noneditable configuration option partial and included it in non-editable-content-options.adoc.

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Pre-checks:

• Branch is correctly prefixed (release-note branch)
• modules/ROOT/nav.adoc has been updated (if applicable).
• Files have been included where required (if applicable).
• Files removed have been deleted, not just excluded from the build (if applicable).
• Files added for New product features include a release note entry.
• Major or minor version changes have updated the supported-versions.adoc table.
• Build passes without console errors, warnings, or issues.

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Review:

• Documentation Team Lead has reviewed.