[doc] nested markup is invalid in rst (#9898)

Apparently nested markup in RST is invalid: https://docutils.sourceforge.io/FAQ.html#is-nested-inline-markup-possible

So currently this line doesn't get rendered properly, leaving inner markdown unrendered, resulting in:
```
https://docutils.sourceforge.io/FAQ.html#is-nested-inline-markup-possible
```

This PR removes the bold which fixes the link.

docs/source/model_sharing.rst

@@ -60,7 +60,7 @@ Basic steps
 In order to upload a model, you'll need to first create a git repo. This repo will live on the model hub, allowing
 users to clone it and you (and your organization members) to push to it.
 
-You can create a model repo **directly from `the /new page on the website <https://huggingface.co/new>`__.**
+You can create a model repo directly from `the /new page on the website <https://huggingface.co/new>`__.
 
 Alternatively, you can use the ``transformers-cli``. The next steps describe that process: