Update src/sage/rings/function_field/drinfeld_modules/charzero_drinfeld_module.py

Co-authored-by: Antoine Leudière <[email protected]>

Author: xcaruso

src/sage/rings/function_field/drinfeld_modules/charzero_drinfeld_module.py

@@ -162,7 +162,8 @@ def exponential(self, prec=Infinity, name='z'):
 
         - ``prec`` -- an integer or ``Infinity`` (default: ``Infinity``);
           the precision at which the series is returned; if ``Infinity``,
-          a lazy power series in returned
+          a lazy power series in returned, else, a classical power series
+          is returned.
 
         - ``name`` -- string (default: ``'z'``); the name of the
           generator of the lazy power series ring