wasm-module: add get_angles doc

wasm-module/src/lib.rs

@@ -183,6 +183,7 @@ impl PlaybackHead{
 	pub fn get_game_controls(&self)->u32{
 		self.head.state().get_controls().bits()
 	}
+	/// Returns an array of [pitch, yaw, roll] in radians.  Yaw is not restricted to any particular range.
 	#[wasm_bindgen]
 	pub fn get_angles(&self,bot:&CompleteBot,time:f64)->Vec<f32>{
 		let time=time::from_float(time).unwrap();