make init documentation more clear

src/Chuck.ts

@@ -85,7 +85,7 @@ export default class Chuck extends window.AudioWorkletNode {
    * @example
    * ```ts
    * // Initialize ChucK with a list of files to preload
-   * theChuck = await Chuck.init([{ serverFilename: "./path/filename.ck", virtualFilename: "filename.ck" }...]);
+   * theChuck = await Chuck.init([{ serverFilename: "./path/filename.wav", virtualFilename: "filename.wav" }...]);
    * ```
    *
    * @example
@@ -102,7 +102,7 @@ export default class Chuck extends window.AudioWorkletNode {
    * theChuck = await Chuck.init([], undefined, undefined, "./src");
    * ```
    *
-   * @param filenamesToPreload Array of Files to preload into ChucK's filesystem `[{serverFilename: "./path/filename", virtualFilename: "filename"}...]`
+   * @param filenamesToPreload Array of auxiliary files to preload into ChucK's filesystem. These can be .wav files, .ck files, .etc. `[{serverFilename: "./path/filename.wav", virtualFilename: "filename.wav"}...]`
    * @param audioContext Optional parameter if you want to use your own AudioContext. **Note**: If an AudioContext is passed in, you will need to connect the ChucK instance to your own destination.
    * @param numOutChannels Optional custom number of output channels. Default is 2 channel stereo and the Web Audio API supports up to 32 channels.
    * @param whereIsChuck Optional custom url to your WebChucK `src` folder containing `webchuck.js` and `webchuck.wasm`. By default, `whereIsChuck` is {@link https://chuck.stanford.edu/webchuck/src | here}.