Fixed broken link on pipelines.mdx
Author: JovaniTarnowski
Pull request: yes

# What does this PR do?
When clicking in task summary the link was redirecting to a 404 not found page.
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Comments:
The docs for this PR live [here](https://moon-ci-docs.huggingface.co/docs/transformers/pr_16937). All of your documentation changes will be reflected on that endpoint.

Clicking on it in chrome links to the correct page. What is your browser/setup?

Hello @LysandreJik  I'm using chrome version 101.0.4951.41 on Windows.

The url that I'm redirected when clicking the link:
https://github.com/huggingface/transformers/blob/b9a768b3ffa80c4c19d024f9f42d5917e7d8109e/docs/source/en/task_summary

This issue has been automatically marked as stale because it has not had recent activity. If you think this still needs to be addressed please comment on this thread.

Please note that issues that do not follow the [contributing guidelines](https://github.com/huggingface/transformers/blob/main/CONTRIBUTING.md) are likely to be ignored.