More spelling…

[JeanLucCoulon]

Hi,
I've found more typos.
s/monochome/monochrome/
s/signficant/significant/

Attached, the diff.
dtdoc-spelling.diff.txt

Regards
Jean-Luc

[elstoc]

Since this is your second similar issue now, can I ask you to consider submitting pull requests to change the underlying markdown files please. It's really not that hard, and for simple changes like this you can do it directly from the web interface (though for more complex changes, where we might want to ask you to modify them, the "proper" process is better)