[charts/redis-ha] Updating README via helm-docs

[DandyDeveloper]

What this PR does / why we need it:

Which issue this PR fixes

(optional, in fixes #<issue number>(, fixes #<issue_number>, ...) format, will close that issue when PR gets merged)

• fixes #

Special notes for your reviewer:

Checklist

[Place an '[x]' (no spaces) in all applicable fields. Please remove unrelated fields.]

• DCO signed
• Chart Version bumped
• Variables are documented in the README.md
• Title of the PR starts with chart name (e.g. [stable/mychartname])

[afarbos]

@DandyDeveloper I think you should keep this part

4.34.1 - Upgrade may complain about selector label changes being immutable

This version introduced changes to the selector labels for the Deployments. Depending on the policies in your cluster, you may see an error like this when upgrading:

Error: UPGRADE FAILED: cannot patch "redis-redis-ha-haproxy" with kind Deployment: Deployment.apps "redis-redis-ha-haproxy" is invalid: spec.selector: Invalid value: v1.LabelSelector{MatchLabels:map[string]string{"app":"redis-ha-haproxy", "component":"haproxy", "release":"redis"}, MatchExpressions:[]v1.LabelSelectorRequirement(nil)}: field is immutable

In these cases, you'll need to delete the Deployment for the haproxy, or simple do a forceful upgrade.