UpdateList REST Documentation is for Local SDK Server not SDK Server

[igooch]

In #3870 we found that the REST documentation for UpdateList:

agones/site/content/en/docs/Guides/Client SDKs/rest.md

Lines 298 to 305 in 77e4f43

	##### Beta: UpdateList
	This function updates the list's properties with the key `players`, such as its capacity and values, returns the updated list details. This will overwrite all existing List.Values with the update list request values. Use addValue or removeValue for modifying the List.Values field.
	###### Example
	```bash
	curl -d '{"capacity": "120", "values": ["player3", "player4"]}' -H "Content-Type: application/json" -X PATCH http://localhost:${AGONES_SDK_HTTP_PORT}/v1beta1/lists/players
	```

follows the Local SDK Server behavior (overwrites both capacity and values):

agones/pkg/sdkserver/localsdk.go

Lines 716 to 724 in 77e4f43

	// UpdateList returns the updated List. Returns not found if the List does not exist (name cannot be updated).
	// **THIS WILL OVERWRITE ALL EXISTING LIST.VALUES WITH ANY REQUEST LIST.VALUES**
	// Use AddListValue() or RemoveListValue() for modifying the List.Values field.
	// Returns invalid argument if the field mask path(s) are not field(s) of the List.
	// If a field mask path(s) is specified, but the value is not set in the request List object,
	// then the default value for the variable will be set (i.e. 0 for "capacity", empty list for "values").
	// [Stage:Beta]
	// [FeatureFlag:CountsAndLists]
	func (l *LocalSDKServer) UpdateList(ctx context.Context, in *beta.UpdateListRequest) (*beta.List, error) {

, and not the SDK Server behavior (only overwrites capacity):

agones/pkg/sdkserver/sdkserver.go

Lines 1056 to 1062 in 77e4f43

	// UpdateList collapses all update capacity requests for a given List into a single UpdateList request.
	// This function currently only updates the Capacity of a List.
	// Returns error if the List does not exist (name cannot be updated).
	// Returns error if the List update capacity is out of range [0,1000].
	// [Stage:Beta]
	// [FeatureFlag:CountsAndLists]
	func (s *SDKServer) UpdateList(ctx context.Context, in *beta.UpdateListRequest) (*beta.List, error) {

.

We should update the documentation to make clear the behavior when developing in Local mode is different from the behavior in the SDK Server.