explain zshift option better for eqdsk in help

git-svn-id: https://spcsvn.epfl.ch/repos/TCV/gdat/trunk@5165 d63d8f72-b253-0410-a779-e742ad2e26cf

crpptbx/TCV/tcv_help_parameters.m

@@ -31,7 +31,7 @@ help_struct_all.fit_tension = ['smoothing value used in interpos fitting routine
                     ' good value' char(10) ...
                    'cxrs: if numeric, default for all cases, if structure, default for non given fields'];
 help_struct_all.time = 'time(s) value(s) if relevant, for example eqdsk is provided by default only for time=1.0s';
-help_struct_all.zshift = 'vertical shift of equilibrium, either for eqdsk or for mapping measurements on to rho surfaces [m]';
+help_struct_all.zshift = 'vertical shift of equilibrium, either for eqdsk (1 to shift to zaxis=0) or for mapping measurements on to rho surfaces [m]';
 help_struct_all.cocos = ['cocos value desired in output, uses eqdsk_cocos_transform. Note should use latter if a specific Ip and/or B0 sign' ...
                     'is wanted. See O. Sauter et al Comput. Phys. Commun. 184 (2013) 293'];
 help_struct_all.edge = '0 (default), 1 to get edge Thomson values';