use second stream in docs example

docs/docs/guides/getting_started.md

@@ -167,13 +167,17 @@ cameras:
  roles:
  - detect
  - rtmp
- - record # <----- Add role
+ - path: rtsp:https://10.0.10.10:554/high_res_stream # <----- Add high res stream
+ roles:
+ - record
  detect: ...
  record: # <----- Enable recording
  enabled: True
  motion: ...
 ```
 
+If you don't have separate streams for detect and record, you would just add the record role to the list on the first input.
+
 By default, Frigate will retain video of all events for 10 days. The full set of options for recording can be found [here](/configuration/index#full-configuration-reference).
 
 ### Step 8: Enable snapshots (optional)