Fix dead link

[kevindiu]

Signed-off-by: kevindiu kevindiujp@gmail.com

Description:

This PR fixed the following dead link:

• https://vald.vdaas.org/docs/user-guides/configuration/
  • kube-apiserver
• https://vald.vdaas.org/docs/user-guides/filtering-configuration/
  • the Vald Filter Gateway document
• https://vald.vdaas.org/docs/troubleshooting/client-side/
  • flow chart

The below dead link on the web will not be fixed since it contains incorrect link only in web repo.

• https://vald.vdaas.org/docs/performance/benchmark/
  • this document

Related Issue:

Versions:

• Go Version: 1.19.2
• Docker Version: 20.10.8
• Kubernetes Version: 1.22.0
• NGT Version: 1.14.8

Checklist:

• I have read the CONTRIBUTING document and completed our CLA agreement.
• I have checked open Pull Requests for the similar feature or fixes?

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