Fix typo in _LazyTickList class comment (lis -> list)

Changed 'lis' to 'list' in the comment of _LazyTickList class in lib/matplotlib/axis.py.

This fixes a minor typo in the documentation to improve code readability.

Author: ganglike248

lib/matplotlib/axis.py

@@ -539,7 +539,7 @@ def __get__(self, instance, owner):
             # attribute (e.g. in certain projection classes which override
             # e.g. get_xaxis_text1_transform).  In order to avoid infinite
             # recursion, first set the majorTicks on the instance temporarily
-            # to an empty lis. Then create the tick; note that _get_tick()
+            # to an empty list. Then create the tick; note that _get_tick()
             # may call reset_ticks(). Therefore, the final tick list is
             # created and assigned afterwards.
             if self._major: