improve html formatting in CITING

CITING

@@ -7,7 +7,7 @@ service to the physics community.  If you have used Kwant for work that has lead
 to a scientific publication, please mention this explicitly in the text body.
 In addition, we ask you to cite the main paper that introduces Kwant:
 
-TO-BE-FILLED-IN
+  TO-BE-FILLED-IN
 
 If you have profited from the quantum transport functionality of Kwant, please
 also cite the upcoming paper that describes the relevant algorithms. The
@@ -16,11 +16,12 @@ reference will be added to this document later, and will also be available at
 
 Kwant owes much of its current performance to the use of the `MUMPS
 <http://graal.ens-lyon.fr/MUMPS/>`_ library for solving systems of sparse linear
-equations.  If you have done high-performance calculations, we suggest citing ::
+equations.  If you have done high-performance calculations, we suggest citing
 
-    P.R. Amestoy, I.S. Duff, J.S. Koster, J.Y. L’Excellent, SIAM. J. Matrix Anal. & Appl. 23 (1), 15 (2001).
+  P. R. Amestoy, I. S. Duff, J. S. Koster, J. Y. L’Excellent, SIAM. J. Matrix
+  Anal. & Appl. **23** (1), 15 (2001).
 
 Finally, if you use the routine for generation of circular ensembles of random
-matrices, please cite ::
+matrices, please cite
 
-    F. Mezzadri, Notices Am. Math. Soc. 54, 592 (2007).
+  \F. Mezzadri, Notices Am. Math. Soc. **54**, 592 (2007).