Update end to end API section with recent changes.

[dmarvp]

Summary
Our virtual device API section configuration is outdated. We've been adding and changing the configuration on the in-depth guide and ignoring this section. Also, the error responses on the HTTP API is also outdated (it doesn't include the categories nor the error codes). There might be other small changes we need to do (eg. it is not needed to rename a PCM file to RAW anymore).