remove non-ASCII characters from doc source files

doc/src/accelerate_intel.txt

@@ -464,7 +464,7 @@ supported.
 
 [References:]
 
-Brown, W.M., Carrillo, J.-M.Y., Mishra, B., Gavhane, N., Thakker, F.M., De Kraker, A.R., Yamada, M., Ang, J.A., Plimpton, S.J., “Optimizing Classical Molecular Dynamics in LAMMPS,” in Intel Xeon Phi Processor High Performance Programming: Knights Landing Edition, J. Jeffers, J. Reinders, A. Sodani, Eds. Morgan Kaufmann. :ulb,l
+Brown, W.M., Carrillo, J.-M.Y., Mishra, B., Gavhane, N., Thakker, F.M., De Kraker, A.R., Yamada, M., Ang, J.A., Plimpton, S.J., "Optimizing Classical Molecular Dynamics in LAMMPS," in Intel Xeon Phi Processor High Performance Programming: Knights Landing Edition, J. Jeffers, J. Reinders, A. Sodani, Eds. Morgan Kaufmann. :ulb,l
 
 Brown, W. M., Semin, A., Hebenstreit, M., Khvostov, S., Raman, K., Plimpton, S.J. Increasing Molecular Dynamics Simulation Rates with an 8-Fold Increase in Electrical Power Efficiency. 2016 International Conference for High Performance Computing. In press. :l
 

doc/src/pair_kolmogorov_crespi_z.txt

@@ -67,6 +67,6 @@ LAMMPS"_Section_start.html#start_3 section for more info.
 :link(KC05) 
 [(KC05)] A. N. Kolmogorov, V. H. Crespi, Phys. Rev. B 71, 235415 (2005)
 
-:link(vanWijk) 
-[(vanWijk)] M. M. van Wijk, A. Schuring, M. I. Katsnelson, and A. Fasolino, 
+:link(vanWijk)
+[(vanWijk)] M. M. van Wijk, A. Schuring, M. I. Katsnelson, and A. Fasolino,
 Physical Review Letters, 113, 135504 (2014)

doc/src/pair_oxdna.txt

@@ -50,7 +50,7 @@ NOTE: These pair styles have to be used together with the related oxDNA bond sty
 "bond_style oxdna/fene"_bond_oxdna.html). The coefficients
 in the above example have to be kept fixed and cannot be changed without reparametrizing the entire model.
 
-Example input and data files can be found in examples/USER/cgdna/examples/duplex1/ and /duplex2/.
+Example input and data files can be found in examples/USER/cgdna/examples/duplex1/ and /duplex2/.
 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/.
 A technical report with more information on the model, the structure of the input file,