Update issue templates

fix html comment

Author: Freymaurer

.github/ISSUE_TEMPLATE/add-team-member.md

@@ -23,7 +23,7 @@ assignees: Freymaurer
 
 ### **Role**:
 
-> Any of `phd`, `master`, ``bachelor`, `alumni`-->
+<!--Any of `phd`, `master`, ``bachelor`, `alumni`-->
 
 
 ### **GitHub**: