Update feature_request.md

.github/ISSUE_TEMPLATE/feature_request.md

@@ -38,10 +38,13 @@ template: feature_request.md
 <!--  A clear and concise description of what the feature is -->
 
 ##### Is your feature request related to a problem. Please describe:
+<!-- A clear and concise description of what the problem is. Ex. I'm always frustrated when [...] -->
 
 ##### Describe the solution you'd like:
+<!-- A clear and concise description of what you want to happen -->
 
 ##### Describe alternatives you've considered:
+<!-- A clear and concise description of any alternative solutions or features you've considered -->
 
 ##### Additional context:
 <!--  Add any other context about the feature here -->