docs: update MQTT payload samples

Author: jakowenko

README.md

@@ -152,7 +152,8 @@ mqtt:
     "type": "latest",
     "duration": 0.28,
     "detector": "compreface",
-    "filename": "2f07d1ad-9252-43fd-9233-2786a36a15a9.jpg"
+    "filename": "2f07d1ad-9252-43fd-9233-2786a36a15a9.jpg",
+    "base64": null
   }
 }
 ```
@@ -176,9 +177,13 @@ mqtt:
       "type": "manual",
       "duration": 0.8,
       "detector": "compreface",
-      "filename": "4d8a14a9-96c5-4691-979b-0f2325311453.jpg"
+      "filename": "dcb772de-d8e8-4074-9bce-15dbba5955c5.jpg",
+      "base64": null
     }
-  ]
+  ],
+  "misses": [],
+  "unknowns": [],
+  "counts": { "person": 1, "match": 1, "miss": 0, "unknown": 0 }
 }
 ```
 
@@ -347,7 +352,7 @@ frigate:
   # stop the processing loop if a match is found
   # if set to false all image attempts will be processed before determining the best match
   stop_on_match: true
-  
+
   # ignore detected areas so small that face recognition would be difficult
   # quadrupling the min_area of the detector is a good start
   # does not apply to MQTT events