tabs converted to spaces in lines 550-552

Author: jecki

doc/Language/py-nutshell.pod6

@@ -548,8 +548,8 @@ Inheritance is done using C<is>:
 Python
 
     class Animal:
-	    def jump(self):
-		    print ("I am jumping")
+        def jump(self):
+            print ("I am jumping")
 
     class Dog(Animal):
         pass