DOC-3355: Accessibility checker overlay was too dark on multiline inline elements

[kemister85]

Ticket: DOC-3355

Site: Staging

Changes:

• Added release note entry for TINY-14246 to modules/ROOT/pages/8.5.0-release-notes.adoc (Accompanying Premium plugin changes > Accessibility Checker section): Accessibility checker overlay was too dark on multiline inline elements.

Note: JIRA documentation section was not filled in for this ticket. Release note body was inferred from changelog YAML, PR title, and changed files. Technical detail about box-shadow stacking may need engineering verification.

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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.