Docs: Added Audio setLoopStart() and setLoopEnd()

docs/api/en/audio/Audio.html

@@ -188,6 +188,16 @@
 		(whether playback should loop).
 		</p>
 
+		<h3>[method:Audio setLoopStart]( [param:Float value] )</h3>
+		<p>
+		Set [link:https://developer.mozilla.org/en-US/docs/Web/API/AudioBufferSourceNode/loopStart source.loopStart] to *value*.
+		</p>
+
+		<h3>[method:Audio setLoopEnd]( [param:Float value] )</h3>
+		<p>
+		Set [link:https://developer.mozilla.org/en-US/docs/Web/API/AudioBufferSourceNode/loopEnd source.loopEnd] to *value*.
+		</p>
+
 		<h3>[method:Audio setMediaElementSource]( mediaElement )</h3>
 		<p>
 		Applies the given object of type [link:https://developer.mozilla.org/en-US/docs/Web/API/HTMLMediaElement HTMLMediaElement] as the source of this audio.<br />

docs/api/zh/audio/Audio.html

@@ -184,6 +184,16 @@
 		(是否循环播放).
 		</p>
 
+		<h3>[method:Audio setLoopStart]( [param:Float value] )</h3>
+		<p>
+		Set [link:https://developer.mozilla.org/en-US/docs/Web/API/AudioBufferSourceNode/loopStart source.loopStart] to *value*.
+		</p>
+
+		<h3>[method:Audio setLoopEnd]( [param:Float value] )</h3>
+		<p>
+		Set [link:https://developer.mozilla.org/en-US/docs/Web/API/AudioBufferSourceNode/loopEnd source.loopEnd] to *value*.
+		</p>
+
 		<h3>[method:Audio setMediaElementSource]( mediaElement )</h3>
 		<p>
 		应用[link:https://developer.mozilla.org/en-US/docs/Web/API/HTMLMediaElement HTMLMediaElement]类型对象作为音源.<br />