Update GetZoneScumminess (citizenfx#776)

Author: TheIndra55

ZONE/GetZoneScumminess.md

@@ -8,11 +8,23 @@ ns: ZONE
 int GET_ZONE_SCUMMINESS(int zoneId);
 ```
 
-```
-cellphone range 1- 5 used for signal bar in iFruit phone  
+Gets the zone scumminess level, used to calculate the cellphone signal strength.
+
+```c
+enum eZoneScumminess
+{
+    SCUMMINESS_POSH = 0,
+    SCUMMINESS_NICE = 1,
+    SCUMMINESS_ABOVE_AVERAGE = 2,
+    SCUMMINESS_BELOW_AVERAGE = 3,
+    SCUMMINESS_CRAP = 4,
+    SCUMMINESS_SCUM = 5
+}
 ```
 
 ## Parameters
-* **zoneId**: 
+* **zoneId**: The zone id
 
 ## Return value
+
+The zone scumminess level