Update README.rst

Author: cadenmyers13

README.rst

@@ -54,7 +54,7 @@ If you use diffpy.fourigui in a scientific publication, we would like you to cit
 
         S. Y. Harouna-Mayer, S. Tao, Z. Gong, M. V. Zimmermann, D. Koziej, A.-C. Dippel, and S. J. L. Billinge
         `Real-Space Texture and Pole-Figure Analysis Using the 3D Pair Distribution
-        Function on a Platinum Thin Film <https://doi.org/10.1107/S2052252522006674>`. *IUCrJ* **9 (5)**, 594–603 (2022).
+        Function on a Platinum Thin Film <https://doi.org/10.1107/S2052252522006674>`_. *IUCrJ* **9 (5)**, 594–603 (2022).
 
 
 Installation