Refactor citation link in README.rst

Author: LacombeLouis

README.rst

@@ -236,11 +236,11 @@ MAPIE is free and open-source software licensed under the `license <https://gith
 
 If you use MAPIE in your research, please cite using:
 
-.. code:: tex
-    @inproceedings{Cordier_Flexible_and_Systematic_2023,
-    author = {Cordier, Thibault and Blot, Vincent and Lacombe, Louis and Morzadec, Thomas and Capitaine, Arnaud and Brunel, Nicolas},
-    booktitle = {Conformal and Probabilistic Prediction with Applications},
-    title = {{Flexible and Systematic Uncertainty Estimation with Conformal Prediction via the MAPIE library}},
-    year = {2023}
-    }
-
+```
+@inproceedings{Cordier_Flexible_and_Systematic_2023,
+author = {Cordier, Thibault and Blot, Vincent and Lacombe, Louis and Morzadec, Thomas and Capitaine, Arnaud and Brunel, Nicolas},
+booktitle = {Conformal and Probabilistic Prediction with Applications},
+title = {{Flexible and Systematic Uncertainty Estimation with Conformal Prediction via the MAPIE library}},
+year = {2023}
+}
+```