Address review comments

Author: oli-obk

.github/ISSUE_TEMPLATE/major_change.md

@@ -7,10 +7,12 @@ assignees: ''
 
 ---
 
+<!--
+
 # Directions
 
-If you'd like to propose a major change to do to rustc, you've come to
-the right place! To do so, please write-up your proposal in this issue.
+If you'd like to propose a major change to rustc, you've come to
+the right place! To do so, please write-up your proposal using this template.
 
 Describe your major change in a sentence or two under the TL;DR section.
 
@@ -21,15 +23,14 @@ Just add any information you think is important.
 List people already mentoring you on this change or reviewing this change in the "Mentors or Reviewers" section
 If there are none, you can also add people that you think would be a good fit.
 You can look at [the experts map](https://github.com/rust-lang/compiler-team/blob/master/content/experts/map.toml) for ideas.
+You can leave this empty if you don't know or are unsure about who to put into the list.
 
 Oh, and please delete this section before you open the issue -- but
 keep the others!
+-->
 
 # TL;DR
 
 # Links and Details
 
 # Mentors or Reviewers
-
-* Chuck Norris
-* Obi Wan Kenobi