[DOC] spell mistake - upgrading pip

[simepy]

Hi !

In the new documentation, I seen some spell mistake, here: https://simpletransformers.ai/docs/upgrading/

in line : pip install --uprade simpletransformers and pip install --uprade transformers
is not --uprade but --upgrade

Otherwise the new documentation is great, Thanks 👍, Bye

[ThilinaRajapakse]

Oh, good spot. I'll fix it.

#342

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