OSDOCS-4231: RN for HAProxy maxconn default update

[skrthomas]

Version(s):

4.12

Issue:

https://issues.redhat.com/browse/OSDOCS-4231

Link to docs preview:

https://51727--docspreview.netlify.app/openshift-enterprise/latest/release_notes/ocp-4-12-release-notes.html#ocp-4-12-networking

QE review:

• [ ] QE has approved this change.

Additional information:

[ocpdocs-previewbot]

🤖 Updated build preview is available at: https://51727--docspreview.netlify.app

Build log: https://circleci.com/gh/ocpdocs-previewbot/openshift-docs/2104

[skrthomas]

@ShudiLi can you please review this RN for QE? Thank you :)

[ShudiLi]

/label qe-approved @skrthomas thanks

[jboxman-rh]

@skrthomas, left a comment, thanks!