doc(types): Add JSDoc to decode method (#137)

Signed-off-by: Klaus Striessnig <[email protected]>

Author: Kirdock

typings/index.d.ts

@@ -2,6 +2,10 @@ declare module '@discordjs/opus' {
 	export class OpusEncoder {
 		public constructor(rate: number, channels: number);
 		public encode(buf: Buffer): Buffer;
+		/**
+		 * Decodes the given Opus buffer to PCM signed 16-bit little-endian
+		 * @param buf Opus buffer
+		 */
 		public decode(buf: Buffer): Buffer;
 		public applyEncoderCTL(ctl: number, value: number): void;
 		public applyDecoderCTL(ctl: number, value: number): void;