STY: Fix formatting and use tight_layout in doc examples.

doc/examples/edges/plot_canny.py

@@ -35,7 +35,8 @@ edges1 = feature.canny(im)
 edges2 = feature.canny(im, sigma=3)
 
 # display results
-fig, (ax1, ax2, ax3) = plt.subplots(nrows=1, ncols=3, figsize=(8, 3), sharex=True, sharey=True)
+fig, (ax1, ax2, ax3) = plt.subplots(nrows=1, ncols=3, figsize=(8, 3),
+                                    sharex=True, sharey=True)
 
 ax1.imshow(im, cmap=plt.cm.jet)
 ax1.axis('off')
@@ -49,7 +50,6 @@ ax3.imshow(edges2, cmap=plt.cm.gray)
 ax3.axis('off')
 ax3.set_title('Canny filter, $\sigma=3$', fontsize=20)
 
-fig.subplots_adjust(wspace=0.02, hspace=0.02, top=0.9,
-                    bottom=0.02, left=0.02, right=0.98)
+fig.tight_layout()
 
 plt.show()