docs(compat): add closeStandaloneSSE migration target to RequestHandlerExtra JSDoc

Author: felixweinberger

packages/core/src/shared/protocol.ts

@@ -312,7 +312,7 @@ export type ClientContext = BaseContext & LegacyContextFields;
  * `ctx.mcpReq` / `ctx.http`; the flat fields remain available so existing
  * handlers using them compile and run unchanged. HTTP-transport-specific fields
  * (`requestInfo`, `closeSSEStream`, `closeStandaloneSSEStream`) are not shimmed
- * and require migration to `ctx.http?.req` / `ctx.http?.closeSSE`. See {@linkcode BaseContext}.
+ * and require migration to `ctx.http?.req` / `ctx.http?.closeSSE` / `ctx.http?.closeStandaloneSSE`. See {@linkcode BaseContext}.
  */
 // eslint-disable-next-line @typescript-eslint/no-unused-vars -- phantom params kept for v1 source compatibility
 export type RequestHandlerExtra<_Req = unknown, _Notif = unknown> = ServerContext;