[enterprise-4.12] OSDOCS-4137: add SE RN entry

[jldohmann]

Version(s): 4.12

Issue: https://issues.redhat.com/browse/OSDOCS-4137

Link to docs preview: http://file.rdu.redhat.com/jdohmann/OSDOCS-4118-RN/release_notes/ocp-4-12-release-notes.html#ocp-4-12-secure-execution-z-linux-one

QE review:

• QE has approved this change.

Additional information: build is failing on the xref to the feature doc #52661 but should be fine when that doc lands.

[ocpdocs-previewbot]

🤖 Updated build preview is available at:
https://51732--docspreview.netlify.app

Build log: https://circleci.com/gh/ocpdocs-previewbot/openshift-docs/5821

[jldohmann]

@SNiemann15 Do you think the RN should have an entry for this in the IBM Z and LinuxONE section too? I realize the content may be duplicated, but I imagine some people jump straight to certain sections that are relevant to them.

[jldohmann]

d38ef56..38fa000 implement Silke feedback
38fa000..c70ccc6d14 add xref to feature doc
c70ccc6d14..29b9041523 implement QE feedback
29b9041523..80ef8fe8c7 implement peer review feedback pt1
80ef8fe8c7..62f7868756 implement peer review feedback pt2
62f7868756..4241ac8076 rebase
4241ac8076..61400bf fix xref

[SNiemann15]

@jldohmann Thanks for bringing that up.
We will surely add SE info to the IBM Z and LinuxONE section too. I need to discuss with @holgwolf if we only want to add SE to the list of supported features or add more info.

[SNiemann15]

@jldohmann I totally forgot to give you the PR for the IBM SE installation: #52661

[jldohmann]

Thank you @SNiemann15 ! Were you and @holgwolf able to sync about what to add to the IBM Z and LinuxONE section of the RN? I'm happy to add it to this PR if so!

[SNiemann15]

@jldohmann Thanks for the offer we have it included in this PR: #53464

[jldohmann]

@holgwolf thank you for the feedback, I've made some updates. Could you PTAL for the lgtm? @mike-nguyen could you also PTAL for QE ack? Thank you!

[bscott-rh]

/label peer-review-in-progress

[bscott-rh]

Couple of small nits/suggestions. I locally built and verified the preview. LGTM, noting that the xref is invalid until the feature docs are merged.

/remove-label peer-review-in-progress
/remove-label peer-review-needed
/label peer-review-done

[holgwolf]

/lgtm

[openshift-ci]

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