Enhance ha document

[keyboardfann]

What type of PR is this?
/kind documentation

What this PR does / why we need it:
The HAproxy config in HA mode document not check master status and exclude the died master, so need to update it.

Which issue(s) this PR fixes:
Fixes #5663

Special notes for your reviewer:
Include test steps on the issue.
#5663

Does this PR introduce a user-facing change?:
NONE

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[k8s-ci-robot]

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[LuckySB]

please sign CLA

[keyboardfann]

I signed it

[LuckySB]

I signed it

Please follow instructions at https://git.k8s.io/community/CLA.md#the-contributor-license-agreement to sign the CLA.

[keyboardfann]

I signed it

[LuckySB]

I signed it

cool, and now please fix markdownlint https://gitlab.com/kargo-ci/kubernetes-sigs-kubespray/-/jobs/444495797

[keyboardfann]

Hi @LuckySB ,
Thanks for the help. Pass the markdown check and waiting for lgtm.

[LuckySB]

/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: keyboardfann, LuckySB

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[LuckySB]

/lgtm