Add details to Documentation MR template

Davis Bickfordrequested to merge
dbickford-update-documentation-template into main

What does this MR do?

Add additional details to the Documentation MR template to help contributors find a tech writer to review.

Why was this MR needed?

To reduce the barrier to finding a tech writer.

What's the best way to test this MR?

Read the md file!

What are the relevant issue numbers?

N/A

Merge request reports