Fix http port on internal telemetry page (open-telemetry#6314)

Author: tiffany76

content/en/docs/collector/internal-telemetry.md

@@ -144,7 +144,7 @@ service:
             exporter:
               otlp:
                 protocol: http/protobuf
-                endpoint: https://backend:4317
+                endpoint: https://backend:4318
 ```
 
 ### Configure internal traces