fixed changelog

[makedoc]

CHANGES/v2.3.txt

@@ -133,7 +133,7 @@ Version 2.3.1
 -------------
 See branch \branch{v2.3} on git repository.
 
-- small change in CS2BACKBONE to symmetrise the ring current contribution with respect to ring rotations (also faster)
+- small change in \ref CS2BACKBONE to symmetrise the ring current contribution with respect to ring rotations (also faster)
 - fixed `plumed-config` that was not working.
 - log file points to the `config.txt` files to allow users to check which features were available in that compiled version.
 - `make clean` in root dir now also cleans `vim` subdirectory.