Fix the order in `GPTNeo`'s docstring
Author: qgallouedec
Pull request: yes

# What does this PR do?

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Fixes # (issue)


## Before submitting
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Comments:
Et voilà :)

_The documentation is not available anymore as the PR was closed or merged._

@qgallouedec To get the setup_and_quality tests passing, you'll need to run `make style` at the top level of the repo and push any changes to this branch.