Merge pull request #21048 from linbingquan/dev-ts-audiocontext

TS: Updated AudioContext.d.ts

src/audio/AudioContext.d.ts

-export const AudioContext: AudioContext;
+/**
+ * see {@link https://github.com/mrdoob/three.js/blob/master/src/audio/AudioContext.js|src/audio/AudioContext.js}
+ */
+export namespace AudioContext {
+
+	export function getContext(): AudioContext;
+
+	export function setContext(): void
+
+}