[Snek] [keith-packard/snek] ca6aca: Add documentation for EV3 Servo motors

[Mikhail Gusarov]

  Branch: refs/heads/master
  Home:   https://github.com/keith-packard/snek
  Commit: ca6aca3c3d24cdab7b8b717c34a0fc8459d426f7
      https://github.com/keith-packard/snek/commit/ca6aca3c3d24cdab7b8b717c34a0fc8459d426f7
  Author: Mikhail Gusarov <dottedmag at dottedmag.net>
  Date:   2020-02-22 (Sat, 22 Feb 2020)

  Changed paths:
    M doc/snek.adoc
    M ports/ev3/snek-ev3.builtin

  Log Message:
  -----------
  Add documentation for EV3 Servo motors

Signed-off-by: Keith Packard <keithp at keithp.com>