Remove mention of REPLACE operation for EXTENSION_CONFIG EnvoyFilter #3049
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Fixes #3034
We are currently mentioning support for a REPLACE operation on extenion_configs in a comment inside the proto file.
But EnvoyFilter patching of extenion_config only supports ADD operation as shown here
https://github.com/istio/istio/blob/master/pilot/pkg/networking/core/v1alpha3/envoyfilter/extension_configuration_patch.go#L35
As stated elsewhere in our documentation: "REPLACE operation is only valid for HTTP_FILTER and NETWORK_FILTER. If the named filter is not found, this operation has no effect".