Spring-ai Fix incorrect comments in OpenAiAudioApi and OpenAiApi

Hello, this PR fixed incorrect Javadoc comments in OpenAiAudioApi and OpenAiApi constructors.

PR contents: - Fixed incorrect comment in OpenAiAudioApi (referred to chat completion instead of audio API). - Added missing @param for webClientBuilder in OpenAiApi.

Fixes #1329

Thank you!

Comment From: markpollack

merged in 897a4114f516ceb3c82f09efb18e2e2189058c35

thanks!