Fix docstring for layout parameter of boxplot (#50647)

Author: mehdimo

pandas/plotting/_core.py

@@ -282,7 +282,7 @@ def hist_frame(
     The size of the figure to create in matplotlib.
 layout : tuple (rows, columns), optional
     For example, (3, 5) will display the subplots
-    using 3 columns and 5 rows, starting from the top-left.
+    using 3 rows and 5 columns, starting from the top-left.
 return_type : {'axes', 'dict', 'both'} or None, default 'axes'
     The kind of object to return. The default is ``axes``.