Update docs/GEPs for features that graduated in v1.1

[candita]

What would you like to be added: Not all features that graduated in v1.1 have been updated in the doc. This may not be an exhaustive list.

These should be updated as Standard

• [ ] https://gateway-api.sigs.k8s.io/mesh/
• [ ] https://gateway-api.sigs.k8s.io/api-types/grpcroute/
• [ ] https://gateway-api.sigs.k8s.io/reference/spec/#gateway.networking.k8s.io%2fv1.ParentReference shows port as experimental

These GEPs should be moved to correct locations:

• [ ] https://gateway-api.sigs.k8s.io/geps/gep-91/ shows as provisional, it is expermental
• [ ] https://gateway-api.sigs.k8s.io/geps/gep-1016/ shows as experimental, it is standard

Why this is needed: To be in sync with release v1.1

[xtineskim]

i can take this on @candita ! correct me if im wrong, but it looks like mesh, grpcroute are already updated to standard?

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