TINYDOC-3526: Deleting a newline within a list item would delete the list item.

[kemister85]

Ticket: TINYDOC-3526 (TINYMCE-13292)

Site: Staging

Changes:

• Added release note entry for TINYMCE-13292 to modules/ROOT/pages/8.7.0-release-notes.adoc (Bug fixes section): Deleting a newline within a list item would delete the list item.

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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.