@BartlebyInk,
Welcome to Able2know, and your first post is fine. You did the correct thing putting the English and Grammar tags on your post. We don't really have "sections" we have tags.
"Discovery" is a noun or an adjective. The verb is "discover".
I think the phrase "The defendant is entitled to discovery." is correct in a legal context (I am not a lawyer, but I did use the term 'discovery' this way in my divorce). But the complete phrase "The defendant is entitled to discovery the evidence... is wrong. I have never heard of this usage, I think it is an error.