missing paragraph field in library.properties

(Filtered from arduino/Arduino@dd77375)

Author: Fede85

library.properties

@@ -3,5 +3,6 @@ version=1.0
 author=Arduino
 maintainer=Arduino <info@arduino.cc>
 sentence=Enables the communication with devices that use the Serial Peripheral Interface (SPI) Bus. For all Arduino boards, BUT Arduino DUE. 
+paragraph=
 url=http://arduino.cc/en/Reference/SPI
 architectures=avr