DOC-2587: Improve Comments documentation for mentionedUids validation

[FarzadHayat]

Ticket: DOC-2587

Site: Staging branch

Changes:

• Add note about known limitation of mentionedUids property.
• Add UID validation to the getEventLog code snippet.

Pre-checks:

• Branch prefixed with feature/<version>/, hotfix/<version>/, staging/<version>/, or release/<version>/.
• [-] modules/ROOT/nav.adoc has been updated (if applicable).
• [-] Included a release note entry for any New product features.
• [-] If this is a minor release, updated productminorversion in antora.yml and added new supported versions entry in modules/ROOT/partials/misc/supported-versions.adoc.

Review:

• Documentation Team Lead has reviewed