fix model name in documentation

[svlandeg]

Description

We've got our model names wrong in the documentation, it should be "gpt-3.5-turbo" instead of "gpt-3-5-turbo". We only replace with hyphens in the registered name for @llm_models 😭

In follow-up work, we should consider matching the names of the model in a case-invariant, punctuation-ignoring fashion. But that'd require a bugfix release, so I suggest we update the documentation now first, because the current example code results in

Config validation error
llm.model -> name	unexpected value; permitted: 'gpt-3.5-turbo', 'gpt-3.5-turbo-16k', 'gpt-3.5-turbo-0613', 'gpt-3.5-turbo-0613-16k'
{'@llm_models': 'spacy.GPT-3-5.v1', 'name': 'gpt-3-5-turbo', 'config': {'temperature': 0.30000000000000004}, 'strict': True}

Types of change

docs bug fix

Checklist

• I confirm that I have the right to submit this contribution under the project's MIT license.
• I ran all tests in tests and usage_examples/tests, and all new and existing tests passed. This includes
  • all external tests (i. e. pytest ran with --external)
  • all tests requiring a GPU (i. e. pytest ran with --gpu)
• My changes don't require a change to the documentation, or if they do, I've added all required information.

[rmitsch]

Argh, sloppy replace on my part.