Apply suggestions from code review

Co-authored-by: burtenshaw <[email protected]>

Author: pcuenca

units/en/unit0/introduction.mdx

@@ -121,7 +121,7 @@ To get the most out of the course, we have some advice:
 
 ## Who are we [[who-are-we]]
 
-Founding authors:
+About the authors:
 
 ### Joffrey Thomas
 
@@ -147,7 +147,6 @@ Thomas is a machine learning engineer at Hugging Face and delivered the successf
 - [Follow Thomas on X](https://x.com/ThomasSimonini)
 - [Follow Thomas on Linkedin](https://www.linkedin.com/in/simoninithomas/)
 
-## Contributing Authors
 
 ### Sergio Paniego