System Information
Windows 8.1 - GTX1060

Blender Version
Broken: 2.79b

Short description of error
I cannot access the bone.roll property in python console.

Exact steps for others to reproduce the error
-In python console, enter:

bpy.ops.object.armature_add()
bpy.ops.object.editmode_toggle()
bpy.data.objects["Armature"].data.bones["Bone"].roll

-You get the following error message :

Traceback (most recent call last):
File "<blender_console>", line 1, in <module>
AttributeError: 'Bone' object has no attribute 'roll'

Which is against the Online Python Reference : https://docs.blender.org/api/blender_python_api_current/bpy.types.EditBone.html#bpy.types.EditBone.roll