Update circuitplayground_bluefruit.md

CP Bluefruit isn't alpha anymore, I think.

Author: rpavlik

_board/circuitplayground_bluefruit.md

@@ -19,9 +19,6 @@ features:
   chip is an nRF52840 microcontroller which is not only more powerful, but also comes
   with Bluetooth Low Energy support for wireless connectivity.
 
-This product is ALPHA hardware at this time, for use by folks who are going to be
-developing software to support it - it's not quite ready for student/beginner use!
-
 The board is round and has alligator-clip pads around it so you don't have to solder
 or sew to make it work. You can power it from USB, a AAA battery pack, or with a
 Lipoly battery (for advanced users). Circuit Playground Bluefruit has built-in USB