add clientOnly to configuration file and API docs

apidocs/openapi.yaml

@@ -190,6 +190,8 @@ components:
                 type: string
               password:
                 type: string
+              clientOnly:
+                type: boolean
 
         # SRT server
         srt:

mediamtx.yml

@@ -311,6 +311,7 @@ webrtcICEServers2: []
   # the secret must be inserted into the password field.
   # username: ''
   # password: ''
+  # clientOnly: false
 
 ###############################################
 # Global settings -> SRT server