Having trouble finding documentation for emulating a keyboard

General
19

I don’t know.

This builds fine for me

void setup() {
  Keyboard.begin();
  Mouse.begin();
}

void loop() {
  Keyboard.print("Hello");
  Mouse.move(5,-5,0);
  delay(1000);
}

Have you actually selected 0.6.0-rc.2 as target?