Update perf_infer_gpu_many.mdx
Fixes doc link typo

related to https://github.com/huggingface/doc-builder/issues/282
_The documentation is not available anymore as the PR was closed or merged._<|||||>link works as expected in https://moon-ci-docs.huggingface.co/docs/transformers/pr_18744/en/perf_infer_gpu_many