OCPBUGS #34373: Added a note in creating the externally managed certificate section

[subhtk]

Version(s): 4.18+

Issue: https://issues.redhat.com/browse/OCPBUGS-34373

Link to docs preview: https://92978--ocpdocs-pr.netlify.app/openshift-enterprise/latest/networking/routes/secured-routes.html#nw-ingress-route-secret-load-external-cert_secured-routes

QE review:

• QE has approved this change.

Additional information:

[ocpdocs-previewbot]

🤖 Tue Jul 08 06:00:42 - Prow CI generated the docs preview:

https://92978--ocpdocs-pr.netlify.app/openshift-dedicated/latest/networking/routes/secured-routes.html
https://92978--ocpdocs-pr.netlify.app/openshift-enterprise/latest/networking/routes/secured-routes.html
https://92978--ocpdocs-pr.netlify.app/openshift-rosa/latest/networking/routes/secured-routes.html

[chiragkyal]

nit: routes/custom-host is a sub-resource
/lgtm
/cc @lihongan

[chiragkyal]

/assign @snarayan-redhat
For traction

[openshift-ci]

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[chiragkyal]

/lgtm

[lunarwhite]

LGTM expect one suggestion

We need also add the same note in cert-manager's section (incert at L16):

openshift-docs/modules/cert-manager-configuring-routes.adoc

Line 16 in 30fd806

@snarayan-redhat It's up to you if make changes in this PR or create another one!

[lunarwhite]

@chiragkyal do you think there is an overlap between the note we are going to add and the one of existing Prerequisites:

openshift-docs/modules/nw-ingress-route-secret-load-external-cert.adoc

Line 22 in 7c57ac3

* You must have the `create` and `update` permissions on the `routes/custom-host`.

[chiragkyal]

@chiragkyal do you think there is an overlap between the note we are going to add and the one of existing Prerequisites:

There is a bit of an overlap, I agree.

I'm fine updating the existing prerequisites with the two bullets we're adding in the Notes, if that helps keep things consistent enough.

[snarayan-redhat]

Closing this PR since following up in PR #96060