STY: Fix formatting and use tight_layout in doc examples.

doc/examples/segmentation/plot_random_walker_segmentation.py

@@ -38,7 +38,8 @@ markers[data > 1.3] = 2
 labels = random_walker(data, markers, beta=10, mode='bf')
 
 # Plot results
-fig, (ax1, ax2, ax3) = plt.subplots(1, 3, figsize=(8, 3.2), sharex=True, sharey=True)
+fig, (ax1, ax2, ax3) = plt.subplots(1, 3, figsize=(8, 3.2),
+                                    sharex=True, sharey=True)
 ax1.imshow(data, cmap='gray', interpolation='nearest')
 ax1.axis('off')
 ax1.set_adjustable('box-forced')
@@ -52,6 +53,5 @@ ax3.axis('off')
 ax3.set_adjustable('box-forced')
 ax3.set_title('Segmentation')
 
-fig.subplots_adjust(hspace=0.01, wspace=0.01, top=1, bottom=0, left=0,
-                    right=1)
+fig.tight_layout()
 plt.show()