correct api doc examples and a typo

doc/python_api/examples/bpy.types.Operator.4.py

@@ -22,7 +22,7 @@ class CustomDrawOperator(bpy.types.Operator):
     my_string = bpy.props.StringProperty(name="String Value")
 
     def execute(self, context):
-        print()
+        print("Test", self)
         return {'FINISHED'}
 
     def invoke(self, context, event):

doc/python_api/examples/bpy.types.Operator.5.py

@@ -31,6 +31,7 @@ class ModalOperator(bpy.types.Operator):
 
     def execute(self, context):
         context.object.location.x = self.value / 100.0
+        return {'FINISHED'}
 
     def modal(self, context, event):
         if event.type == 'MOUSEMOVE':  # Apply

doc/python_api/rst/info_best_practice.rst

@@ -83,7 +83,7 @@ Even though you're not looping on the list data **python is**, so you need to be
 
 Modifying Lists
 ^^^^^^^^^^^^^^^
-In python we can add and remove from a list, This is slower when the list length is modifier, especially at the start of the list, since all the data after the index of modification needs to be moved up or down 1 place.
+In python we can add and remove from a list, This is slower when the list length is modified, especially at the start of the list, since all the data after the index of modification needs to be moved up or down 1 place.
 
 The most simple way to add onto the end of the list is to use ``my_list.append(list_item)`` or ``my_list.extend(some_list)`` and the fastest way to remove an item is ``my_list.pop()`` or ``del my_list[-1]``.