DOC: Update README.md to use URL in documentation link. (#54090)

Update README.md to use URL in documentation link.

Co-authored-by: nabdoni <nabil.ouajdouni@gmail.com>

Author: fgo

README.md

@@ -156,7 +156,7 @@ See the full instructions for [installing from source](https://pandas.pydata.org
 [BSD 3](LICENSE)
 
 ## Documentation
-The official documentation is hosted on PyData.org: https://pandas.pydata.org/pandas-docs/stable
+The official documentation is hosted on [PyData.org](https://pandas.pydata.org/pandas-docs/stable/).
 
 ## Background
 Work on ``pandas`` started at [AQR](https://www.aqr.com/) (a quantitative hedge fund) in 2008 and