Update lib/matplotlib/scale.py

Co-authored-by: Elliott Sales de Andrade <quantum.analyst@gmail.com>

Author: timhoffm

lib/matplotlib/scale.py

@@ -744,7 +744,6 @@ def __init__(self, axis=None, nonpositive='mask', *,
                 It can already now be left out because of special preprocessing,
                 so that ``LogitScale()`` is valid.
 
-        Currently unused.
         nonpositive : {'mask', 'clip'}
             Determines the behavior for values beyond the open interval ]0, 1[.
             They can either be masked as invalid, or clipped to a number very