Typo in handouts tips

[LouisJustinTALLOT]

In the last paragraph we read documenation instead of documentation...

[LouisJustinTALLOT]

There are in fact multiple typos in this paragraph...

We should read this (as of handout-tips.tex):

Matplotlib comes with an extensive documentation explaining the
details of each command and is generally accompanied by examples.
Together with the huge online gallery, this documentation is a
gold-mine.

[rougier]

Thanks. I need to rebuild all the sheets once everything has been merged. Sorry for being very late on that.