Clarify usage and limitations in doc string

mraleson · mraleson · commit 65f350b7fead · 2022-04-16T14:31:04.000-06:00
diff --git a/adafruit_ble/characteristics/json.py b/adafruit_ble/characteristics/json.py
@@ -19,7 +19,7 @@
 
 
 class JsonCharacteristic(Characteristic):
-    """Json string characteristic."""
+    """Json string characteristic for JSON serializable values of a limited size (max_length)."""
 
     def __init__(
         self,
