swap standard deviations so that men's means are shown with men's std…

…dev and vice versa

It appears as if someone accidentally swapped the standard deviations of men and women in this example.

examples/pylab_examples/bar_stacked.py

@@ -12,9 +12,9 @@
 ind = np.arange(N)    # the x locations for the groups
 width = 0.35       # the width of the bars: can also be len(x) sequence
 
-p1 = plt.bar(ind, menMeans, width, color='r', yerr=womenStd)
+p1 = plt.bar(ind, menMeans, width, color='r', yerr=menStd)
 p2 = plt.bar(ind, womenMeans, width, color='y',
-             bottom=menMeans, yerr=menStd)
+             bottom=menMeans, yerr=womenStd)
 
 plt.ylabel('Scores')
 plt.title('Scores by group and gender')