Link to webaudio example is 404

[guest271314]

Describe the Bug

Link to webaudio example is 404

Steps to Reproduce

1. Go to https://github.com/rustwasm/wasm-bindgen/tree/master/examples/webaudio
2. Click on 'View compiled example online'

If applicable, add a link to a test case (as a zip file or link to a repository we can clone).

https://rustwasm.github.io/wasm-bindgen/exbuild/web-audio/

Expected Behavior

Link to example to not be 404

Actual Behavior

Link to example is 404

[Xuanwo]

It's a typo and I made a PR to fix it.