Ch07: another fix for decision-region plots

[vmirly]

Original:

plt.text(-3.5, -5., 
         s='Sepal width [standardized]', 
         ha='center', va='center', fontsize=12)
plt.text(-12.5, 4.5, 
         s='Petal length [standardized]', 
         ha='center', va='center', 
         fontsize=12, rotation=90)

#plt.savefig('images/07_05', dpi=300)
plt.show()

Change:

plt.tight_layout()

plt.text(1, -0.2,
         s='Sepal width [standardized]',
         ha='center', va='center', fontsize=12,
         transform=axarr[1, 0].transAxes)

plt.text(-0.12, 0,
         s='Petal length [standardized]',
         ha='center', va='center',
         fontsize=12, rotation=90,
         transform=axarr[0, 0].transAxes)

[rasbt]

we decided not changing that