[OSDOCS-18957]: Updating 4.21 rns to note feature support change

[lahinson]

Version(s): 4.21 only

Issue: https://redhat.atlassian.net/browse/OSDOCS-18957

Link to docs preview:

• Notable technical changes: https://110173--ocpdocs-pr.netlify.app/openshift-enterprise/latest/release_notes/ocp-4-21-release-notes.html#rn-ocp-release-notes-notable-changes_release-notes (scroll to end of list)
• TP features status: https://110173--ocpdocs-pr.netlify.app/openshift-enterprise/latest/release_notes/ocp-4-21-release-notes.html#rn-ocp-release-notes-technology-preview-tables_release-notes (eventTTL feature is removed from this section)

QE review:

• QE has approved this change.

Change management:

• Change management is complete for this change.

Additional information:

[ocpdocs-previewbot]

🤖 Wed Apr 15 16:27:52 - Prow CI generated the docs preview:

https://110173--ocpdocs-pr.netlify.app/openshift-enterprise/latest/release_notes/ocp-4-21-release-notes.html

[openshift-ci]

@lahinson: all tests passed!

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[tjungblu]

/lgtm

[sandeepknd]

/lgtm from QE.