Remove typo in perf_train_gpu_many.mdx
Author: MrGeislinger
Pull request: yes

Simple typo in the documentation (excess `w` in  the word `bottom`)

# What does this PR do?

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Fixes # (issue)


## Before submitting
- [x] This PR fixes a typo or improves the docs (you can dismiss the other checks if that's the case).
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Comments:
_The documentation is not available anymore as the PR was closed or merged._