Update doc/functions/openAIChat.md

I know why those happened, and can avoid them in the future!

In MLX files, you can create hyperlinks which link to lines in the same file. I tried to see whether this would translate into the markdown - turns out it hasn't. What it has done is taken those hyperlinks and just given them extra backticks with no functionality. So long as I stop trying to link between passages, this should not be an issue.

Co-authored-by: Christopher Creutzig <89011131+ccreutzi@users.noreply.github.com>

Author: MiriamScharnke

doc/functions/openAIChat.md

@@ -28,7 +28,7 @@ To connect to the OpenAI API, you need a valid API key. For information on how t
 `chat = openAIChat` creates an `openAIChat` object. Connecting to the OpenAI API requires a valid API key. Either set the environment variable `OPENAI_API_KEY` or specify the `APIKey` name\-value argument.
 
 
-`chat = openAIChat(``systemPrompt``)` creates an `openAIChat` object with the specified system prompt.
+`chat = openAIChat(systemPrompt)` creates an `openAIChat` object with the specified system prompt.
 
 
 `chat = openAIChat(___,APIKey=key)` uses the specified API key.