Make sure command also works with Oh-my-zsh (#2905)

Many people use oh-my-zsh for their command line: https://ohmyz.sh/ 

Adding `""` should work both on ohmyzsh and native bash
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blessedcoolant 2023-03-10 19:05:22 +13:00 committed by GitHub
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@ -148,7 +148,7 @@ manager, please follow these steps:
=== "CUDA (NVidia)"
```bash
pip install InvokeAI[xformers] --use-pep517 --extra-index-url https://download.pytorch.org/whl/cu117
pip install "InvokeAI[xformers]" --use-pep517 --extra-index-url https://download.pytorch.org/whl/cu117
```
=== "ROCm (AMD)"