Merge pull request matplotlib#2584 from magnunor/fix_legend_typo

Fix typo in legend documentation

Author: mdboom

lib/matplotlib/legend.py

@@ -195,7 +195,7 @@ def __init__(self, parent, handles, labels,
         borderpad          the fractional whitespace inside the legend border
         labelspacing       the vertical space between the legend entries
         handlelength       the length of the legend handles
-        handleheight       the length of the legend handles
+        handleheight       the height of the legend handles
         handletextpad      the pad between the legend handle and text
         borderaxespad      the pad between the axes and legend border
         columnspacing      the spacing between columns