Added instructions in PR template to make crediting people more clear (…

…#5755)

.github/pull_request_template.md

@@ -17,7 +17,8 @@
 
 ## **People who collaborated with me in this PR**
 <!-- Please credit everyone else that contributed to this PR, be it code and/or assets. -->
-<!-- Use their GitHub tag if they have one. -->
+<!-- Use their GitHub tag if they have one (or add "@/" at the start if they don't). Be sure to start the line using @ so the automatic changelog can properly detect the collaborators. -->
+<!-- Eg.: "@Lunos for sprites, @/Masuda for support" -->
 <!-- If it doesn't apply, feel free to remove this section. -->
 
 ## Feature(s) this PR does NOT handle: