docs(http): clarify duplicate socket handling guard

Agent-Logs-Url: https://github.com/mswjs/interceptors/sessions/7b984ca5-b412-4ec5-8fc3-8f490e11d77b

Co-authored-by: mikicho <11459632+mikicho@users.noreply.github.com>

Author: Copilot

src/interceptors/http/index.ts

@@ -221,6 +221,10 @@ export class HttpRequestInterceptor extends Interceptor<HttpRequestEventMap> {
                 },
               })
 
+              /**
+               * Skip already claimed sockets to avoid duplicate handling when
+               * multiple interceptors observe the same connection.
+               */
               if (socketController['readyState'] !== SocketController.PENDING) {
                 return
               }