docs(templates): improve formatting

Improve formatting of GitHub feature request template

.github/ISSUE_TEMPLATE/feature_request.md

@@ -7,14 +7,19 @@ assignees: ''
 
 ---
 
-**Is your feature request related to a problem? Please describe.**
+# 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**
+# Describe the solution you'd like
 A clear and concise description of what you want to happen.
 
-**Describe alternatives you've considered**
+# Describe alternatives you've considered
 A clear and concise description of any alternative solutions or features you've considered.
+## Option x
+Describe this option
 
-**Additional context**
+## Option y
+Describe this option
+
+# Additional context
 Add any other context or screenshots about the feature request here.