Fix code examples to load gpt 1 openai community model
Author: JuanFKurucz
Pull request: yes

# What does this PR do?

Fixes the reference to the model `openai-gpt` that seems to have changed its name from `gpt` to `openai-gpt`


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Comments:
Can you remove the `torch.float16` bit as well, while we're editing this file? GPT-1 was definitely trained in the float32 era, so I suspect that line will reduce accuracy a lot :sweat_smile: 

> Can you remove the `torch.float16` bit as well, while we're editing this file? GPT-1 was definitely trained in the float32 era, so I suspect that line will reduce accuracy a lot 😅

Sure, i will check that is functional and do so

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