[analysis_server] Mark editableArguments / editArgument as not-experimental

This should not be landed until after flutter/devtools#8990 lands and is included in the version of DevTools in the Dart SDK.

Fixes #55629

Change-Id: I19a72ef0e3680aa620d47f8f9556e38b90a98aa4
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/414060
Reviewed-by: Brian Wilkerson <[email protected]>
Reviewed-by: Elliott Brooks <[email protected]>
Commit-Queue: Brian Wilkerson <[email protected]>

Author: DanTup

pkg/analysis_server/lib/src/lsp/constants.dart

@@ -157,12 +157,12 @@ abstract final class CustomMethods {
   /// Method for requesting the set of editable arguments at a location in a
   /// document.
   static const dartTextDocumentEditableArguments = Method(
-    'experimental/dart/textDocument/editableArguments',
+    'dart/textDocument/editableArguments',
   );
 
   /// Method for adding/editing an argument at a location in a document.
   static const dartTextDocumentEditArgument = Method(
-    'experimental/dart/textDocument/editArgument',
+    'dart/textDocument/editArgument',
   );
 
   // TODO(dantup): Remove custom AnalyzerStatus status method soon as no clients

pkg/analysis_server/tool/lsp_spec/README.md

@@ -285,13 +285,30 @@ Params: `{ uri: Uri }`
 
 Notifies the client that the content in the virtual file with `uri` may have changed (for example because a macro executed and regenerated its content).
 
-### dart/connectToDtd Method (Experimental)
+### dart/connectToDtd Method
 
 Direction: Client -> Server
 Params: `{ uri: Uri }`
 Returns: `null`
 
-Provides the URI of a Dart Tooling Daemon server to allow the LSP server to connect and provide access to a subset of LSP functionality to DTD clients. This support is still a work in progress and should not be used outside of development (yet).
+Provides the URI of a Dart Tooling Daemon server to allow the LSP server to connect and provide access to a subset of LSP functionality to DTD clients. This method can only be called by the tool that owns the analysis server process (via stdin/stdout) and not through DTD.
+
+### dart/textDocument/editableArguments Method
+
+Direction: Client -> Server
+Params: `TextDocumentPositionParams`
+Returns: `EditableArguments`
+
+Returns the list of editable arguments at a position within the current document. This information can be used to update arguments in the document by using the `dart/textDocument/editArgument` request.
+
+### dart/textDocument/editArgument Method
+
+Direction: Client -> Server
+Params: `EditArgumentParams`
+Returns: `Null`
+
+Instructs the editor to edit the value of an argument (that was returned from a `dart/textDocument/editableArguments` request).
+
 
 ## Client Commands