Fix: typos

Author: sokoliva

src/a2a/server/apps/jsonrpc/jsonrpc_app.py

@@ -295,7 +295,7 @@ async def _handle_requests(self, request: Request) -> Response:  # noqa: PLR0911
                     request_id, str | int
                 ):
                     request_id = None
-            # If content lenght check is not diasbled,
+            # If content lenght check is not disabled,
             # treat very large payloads as invalid request (-32600) before routing
             if not self._disable_content_length_check:
                 with contextlib.suppress(Exception):