docs: fix grammar in ButtonPacket.pressed docstring

Author: ktdreyer

adafruit_bluefruit_connect/button_packet.py

@@ -66,7 +66,8 @@ def __init__(self, button, pressed):
         """Construct a ButtonPacket from a button name and the button's state.
 
         :param str button: a single character denoting the button
-        :param bool pressed: ``True`` if button is pressed; ``False`` if it is release.
+        :param bool pressed: ``True`` if button is pressed; ``False`` if it is
+                             released.
         """
         # This check will catch wrong length and also non-sequence args (like an int).
         try: