Update buttons.rst

Documentation/pycardium/buttons.rst

@@ -21,10 +21,10 @@ in your scripts.
       if pressed != 0:
          break
 
-   if pressed & buttons.BOTTOM_LEFT != 0:
+   if pressed && buttons.BOTTOM_LEFT != 0:
       print("Left button pressed!")
 
-   if pressed & buttons.BOTTOM_RIGHT != 0:
+   if pressed && buttons.BOTTOM_RIGHT != 0:
       print("Right button pressed!")
 
 .. py:function:: read(mask)