Add explicit note to that docs apply to latest release

[ADubhlaoich]

Proposed changes

These commits add a small note near the prerequisites part of a few installation-based sections of the documentation to draw the reader's attention towards the fact that documentation applies only to the latest release for NGINX Ingress Controller.

Checklist

Before creating a PR, run through this checklist and mark each as complete.

• I have read the CONTRIBUTING doc
• I have added tests that prove my fix is effective or that my feature works
• I have checked that all unit tests pass after adding my changes
• I have updated necessary documentation
• I have rebased my branch onto main
• I will ensure my PR is targeting the main branch and pulling from my branch from my own fork

[github-actions]

Dependency Review

✅ No vulnerabilities or license issues found.

Scanned Manifest Files

[codecov]

Codecov Report

Merging #4093 (babc5d3) into main (a6aa714) will decrease coverage by 0.04%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main    #4093      +/-   ##
==========================================
- Coverage   51.88%   51.84%   -0.04%     
==========================================
  Files          59       59              
  Lines       16710    16710              
==========================================
- Hits         8670     8664       -6     
- Misses       7743     7747       +4     
- Partials      297      299       +2     

see 2 files with indirect coverage changes

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[brianehlert]

@ADubhlaoich
Is this to add a disclaimer to main as opposed to making folks aware that the URL is release sensitive?

I ask because it reads like a disclaimer, rather than noting that the URL is release version sensitive. <- which I think is a more instructive way to address the problem.

I assume that we have some feedback that main is being used to reference documents while using some older release. You can DM me any details of the reasoning.

[lucacome]

we also don't have a way to point people to a different version of the docs if they're not using the latest release, so this might be confusing.