make links to citations unique across files 1/2

doc/src/bond_oxdna.txt

@@ -52,7 +52,7 @@ Example input and data files for DNA duplexes can be found in examples/USER/cgdn
 A simple python setup tool which creates single straight or helical DNA strands,
 DNA duplexes or arrays of DNA duplexes can be found in examples/USER/cgdna/util/.
 
-Please cite "(Henrich)"_#Henrich and the relevant oxDNA articles in any publication that uses this implementation. 
+Please cite "(Henrich)"_#Henrich2 and the relevant oxDNA articles in any publication that uses this implementation. 
 The article contains more information on the model, the structure of the input file, the setup tool
 and the performance of the LAMMPS-implementation of oxDNA.
 The preprint version of the article can be found "here"_PDF/USER-CGDNA.pdf.
@@ -74,7 +74,7 @@ LAMMPS"_Section_start.html#start_3 section for more info on packages.
 
 :line
 
-:link(Henrich)
+:link(Henrich2)
 [(Henrich)] O. Henrich, Y. A. Gutierrez-Fosado, T. Curk, T. E. Ouldridge, Eur. Phys. J. E 41, 57 (2018).
 
 :link(oxdna_fene)