docs/library/machine.WDT: Add note that WDT is only available on WiPy.

dpgeorge · dpgeorge · commit 64c5a9435c3b · 2016-08-17T14:22:39.000+10:00
diff --git a/docs/library/machine.WDT.rst b/docs/library/machine.WDT.rst
@@ -14,6 +14,8 @@ Example usage::
     wdt = WDT(timeout=2000)  # enable it with a timeout of 2s
     wdt.feed()
 
+Availability of this class: WiPy.
+
 Constructors
 ------------
 
