Update PULL_REQUEST_TEMPLATE.md

Author: LandauRaz

.github/PULL_REQUEST_TEMPLATE.md

@@ -1,3 +1,7 @@
+---
+assignees: landauraz
+---
+
 ### Description of the Changes
 
 Please add a detailed description of the change you have made.
@@ -12,7 +16,9 @@ Please paste the specific URL(s) of the content that this PR addresses here.
 
 ### Check List
 
-- [ ] Changes have been done against main branch, and PR does not conflict
+- [ ] Changes made against main branch and PR does not conflict
 - [ ] PR title is meaningful, e.g: `fix: minor typos in README`
+- [ ] Detailed description added under "Description of the Changes"
+- [ ] Specific URL(s) added under "PR Preview URL"