Add print temperature to CPUTemperature example and add temperature property to docs

docs/api_other.rst

@@ -31,6 +31,7 @@ CPUTemperature
 ==============
 
 .. autoclass:: CPUTemperature
+    :members: temperature, is_active
 
 Base Classes
 ============
@@ -50,4 +51,3 @@ InternalDevice
 
 .. autoclass:: InternalDevice()
     :members:
-

gpiozero/other_devices.py

@@ -87,10 +87,12 @@ class CPUTemperature(InternalDevice):
 
         # Use minimums and maximums that are closer to "normal" usage so the
         # bar graph is a bit more "lively"
-        temp = CPUTemperature(min_temp=50, max_temp=90)
+        cpu = CPUTemperature(min_temp=50, max_temp=90)
+
+        print('Initial temperature: {}C'.format(cpu.temperature))
 
         graph = LEDBarGraph(5, 6, 13, 19, 25, pwm=True)
-        graph.source = temp.values
+        graph.source = cpu.values
 
         pause()