Fixed some libraries metadata.

Author: cmaglie

library.properties

@@ -4,5 +4,6 @@ author=Michael Margolis, Arduino
 maintainer=Arduino <[email protected]>
 sentence=Allows Arduino boards to control a variety of servo motors. For all Arduino boards.
 paragraph=This library can control a great number of servos.<br />It makes careful use of timers: the library can control 12 servos using only 1 timer.<br />On the Arduino Due you can control up to 60 servos.<br />
+category=Device Control
 url=http://arduino.cc/en/Reference/Servo
 architectures=avr,sam