inaccuracies in the documentation

[alex37529]

Hi in your doc can see

`from py3.Block import Dat

Specify .dat to load path = 'Blocks/' f = 'blk00003.dat' dat = Dat(path, f, verb=5)

Create Dat object dat = Dat(f, verb=5)`

But in py3 no module Block And in block.py no class Dat