fixed spelling error in pr__request_template.md (#1127)

Contributor was spelled wrong

Author: zladatm

.github/pull_request_template.md

@@ -7,9 +7,9 @@
 <!--- How would it be useful for your FIR/VACC -->
 
 
-## Approved contributior?
+## Approved contributor?
 <!--- We will only approve changes that is approved from staff -->
 <!--- Only select **one** of the following options - Do not select all. -->
-- [ ] I am on the approved contributers list
+- [ ] I am on the approved contributors list
 - [ ] I have sent an request by email to get approved
-- [ ] Someone on the approved contributer list will review this request
+- [ ] Someone on the approved contributor list will review this request