chore: decrease heading level of issue templates

.github/ISSUE_TEMPLATE/bug-report.md

@@ -6,22 +6,22 @@ labels: 'Type: Bug, Status: Triage'
 assignees: ''
 ---
 
-# Bug Report
+## Bug Report
 
 <!-- Why the issue was filed? -->
 
-## Expected behavior
+### Expected behavior
 
 <!-- What you expected to happen? -->
 
-## Actual behavior
+### Actual behavior
 
 <!-- What actually happened? -->
 
-## Steps to reproduce
+### Steps to reproduce
 
 <!-- How can someone else make/see it happen -->
 
-## Proposed changes
+### Proposed changes
 
 <!-- If you have a proposed change, workaround or fix, describe it here -->

.github/ISSUE_TEMPLATE/feature-request.md

@@ -6,4 +6,4 @@ labels: 'Type: Idea, Status: Triage'
 assignees: ''
 ---
 
-# Suggestion
+## Suggestion