Update bug-report.md

.github/ISSUE_TEMPLATE/bug-report.md

@@ -12,17 +12,17 @@ IMPORTANT
 Issues that don't use this template will be ignored and closed.
 -->
 
-**Perform all steps below and tick them with [x]**
+### Perform all steps below and tick them with [x]
 - [ ] Check the related part of the [Documentation](https://docs.lvgl.io/)
 - [ ] Update lvgl to the latest version
 - [ ] Reproduce the issue in a [Simulator](https://docs.lvgl.io/latest/en/html/get-started/pc-simulator.html)
 
-**Describe the bug**
+### Describe the bug
 <!-- 
 A clear and concise description of what the bug is. 
 -->
 
-**To Reproduce**
+### To Reproduce
 <!--
 Provide a small, independent code sample that can be used to reproduce the issue. 
 Ideally this should work in the PC simulator unless the problem is specific to a platform.
@@ -32,12 +32,12 @@ your code here
 ```
 -->
 
-**Expected behavior**
+### Expected behavior
 <!-- 
 A clear and concise description of what you expected to happen. 
 -->
 
-**Screenshots or video**
+### Screenshots or video
 <!--
 If applicable, add screenshots to help explain your problem.
 -->