message: Document CodeActionOptions return type
diff: @@ -792,7 +792,9 @@ export interface _ServerCapabilities {
  */
  workspaceSymbolProvider?: boolean;
  /**
  - * The server provides code actions.
  + * The server provides code actions. CodeActionOptions may only be
  + * specified if the client states that it supports
  + * `codeActionLiteralSupport` in its initial `initialize` request.
  */
  codeActionProvider?: boolean | CodeActionOptions;
  /**
  