Small fix to python agent-config option (#3743)

Co-authored-by: Phillip Carter <[email protected]>

content/en/docs/instrumentation/python/automatic/agent-config.md

@@ -31,8 +31,8 @@ Here's an explanation of what each configuration does:
   are being exported to `console` (stdout) and with `otlp`. The `otlp` option
   tells `opentelemetry-instrument` to send the traces to an endpoint that
   accepts OTLP via gRPC. In order to use HTTP instead of gRPC, add
-  `--exporter_otlp_protocol http`. The full list of available options for
-  traces_exporter, see the Python contrib
+  `--exporter_otlp_protocol http/protobuf`. The full list of available options
+  for traces_exporter, see the Python contrib
   [OpenTelemetry Instrumentation](https://github.com/open-telemetry/opentelemetry-python-contrib/tree/main/opentelemetry-instrumentation).
 - `metrics_exporter` specifies which metrics exporter to use. In this case,
   metrics are being exported to `console` (stdout). It is currently required for