Updated structure of Issue template for clarity

.github/ISSUE_TEMPLATE/bug-report.md

@@ -7,21 +7,25 @@ about: Report a bug in Flask (not other projects which depend on Flask)
 This issue tracker is a tool to address bugs in Flask itself. Please use
 Pallets Discord or Stack Overflow for questions about your own code.
 
-Replace this comment with a clear outline of what the bug is.
+Replace these comments with a clear outline of what the bug is.
 -->
 
-<!--
-Describe how to replicate the bug.
+#### How to replicate the bug:
 
+<!--
 Include a minimal reproducible example that demonstrates the bug.
 Include the full traceback if there was an exception.
 -->
 
+#### Current behavior: (bug)
+
+#### Expected behavior: (correct)
+
 <!--
 Describe the expected behavior that should have happened but didn't.
 -->
 
-Environment:
+#### Environment:
 
 - Python version:
 - Flask version: