Fixed a non-working hyperlink in the README.md file (#19434)

* Fixed a non-working hyperlink in the README.md file

The hyperlink to the community notebooks was outdated.

* Fixing missing double slash in hyperlink

notebooks/README.md

@@ -92,4 +92,4 @@ You can open any page of the documentation as a notebook in colab (there is a bu
 
 ## Community notebooks:
 
-More notebooks developed by the community are available [here](https:hf.co/docs/transformers/community#community-notebooks).
+More notebooks developed by the community are available [here](https://hf.co/docs/transformers/community#community-notebooks).