Fixed some libraries metadata.

Author: cmaglie

library.properties

@@ -4,5 +4,6 @@ author=Arduino
 maintainer=Arduino <info@arduino.cc>
 sentence=Allows multiple tasks to run at the same time, without interrupting each other. For Arduino DUE only.
 paragraph=The Scheduler library enables the Arduino Due to run multiple functions at the same time. This allows tasks to happen without interrupting each other.</br>This is a cooperative scheduler in that the CPU switches from one task to another. The library includes methods for passing control between tasks.
+category=Other
 url=http://arduino.cc/en/Reference/Scheduler
 architectures=sam