All broken links were fixed in contributing file (huggingface#19760)

CONTRIBUTING.md

@@ -49,7 +49,7 @@ For something slightly more challenging, you can also take a look at the [Good S
 
 ## Fixing outstanding issues
 
-If you notice an issue with the existing code and have a fix in mind, feel free to [start contributing](contributing#start-contributing-pull-requests) and open a Pull Request!
+If you notice an issue with the existing code and have a fix in mind, feel free to [start contributing](https://github.com/huggingface/transformers/blob/main/CONTRIBUTING.md/#create-a-pull-request) and open a Pull Request!
 
 ## Submitting a bug-related issue or feature request
 
@@ -259,7 +259,7 @@ You'll need **[Python 3.7]((https://github.com/huggingface/transformers/blob/mai
 
    If you've already opened a pull request, you'll need to force push with the `--force` flag. Otherwise, if the pull request hasn't been opened yet, you can just push your changes normally.
 
-6. Now you can go to your fork of the repository on GitHub and click on **Pull request** to open a pull request. Make sure you tick off all the boxes in our [checklist](contributing#checklist) below. When you're ready, you can send your changes to the project maintainers for review.
+6. Now you can go to your fork of the repository on GitHub and click on **Pull request** to open a pull request. Make sure you tick off all the boxes in our [checklist](https://github.com/huggingface/transformers/blob/main/CONTRIBUTING.md/#pull-request-checklist) below. When you're ready, you can send your changes to the project maintainers for review.
 
 7. It's ok if maintainers request changes, it happens to our core contributors
    too! So everyone can see the changes in the pull request, work in your local
@@ -295,7 +295,7 @@ related images in the following repository:
 [huggingface/documentation-images](https://huggingface.co/datasets/huggingface/documentation-images).
 You can open a PR on this dataset repostitory and ask a Hugging Face member to merge it.
 
-For more information about the checks run on a pull request, take a look at our [Checks on a Pull Request](pr_checks) guide.
+For more information about the checks run on a pull request, take a look at our [Checks on a Pull Request](https://huggingface.co/docs/transformers/pr_checks) guide.
 
 ### Tests