Changed the link to the correct citing example

Author: sveneschlbeck

README.rst

@@ -98,7 +98,7 @@ Citing Matplotlib
 If Matplotlib contributes to a project that leads to publication, please
 acknowledge this by citing Matplotlib.
 
-`A ready-made citation entry <https://matplotlib.org/stable/citing.html>`_ is
+`A ready-made citation entry <https://matplotlib.org/stable/users/project/citing.html>`_ is
 available.
 
 Research notice