Check examples and tables to remove usages of `spec.from[].targetRef.kind: MeshService`

[lahabana]

What happened?

Since: https://github.com/kumahq/kuma/issues/9258 landed in 2.7 we should make sure docs don't advertise a deprecated use case.

[kleinfreund]

The examples here need updating:

• https://kuma.io/docs/dev/policies/meshfaultinjection/#examples
• https://kuma.io/docs/dev/policies/meshtrafficpermission/#examples
• https://kuma.io/docs/dev/guides/gateway-builtin/#define-a-route-using-meshhttproute