twrpme: add headers to markdown

Change-Id: Ib832e99feeab3d89bf5d2c52075805aeafcaf096
diff --git a/_posts/2021-03-17-twrp-3.5.1-released.markdown b/_posts/2021-03-17-twrp-3.5.1-released.markdown
index 29e66ed..57a2f32 100644
--- a/_posts/2021-03-17-twrp-3.5.1-released.markdown
+++ b/_posts/2021-03-17-twrp-3.5.1-released.markdown
@@ -16,13 +16,13 @@
 
 
 What's new in {{ page.version }}:
-Android 9 Branch:
+# Android 9 Branch:
 - Fixes
   - Build compilation in 7.1 tree - CaptainThrowback
   - SAR: Don't follow symbolic links for block devices - bigbiff
   - SAR Update script name for clarity - CaptainThrowback
 
-Android 9 and Android 10 Branches:
+# Android 9 and Android 10 Branches:
 - Wrappedkey support running only on FBE devices - CaptainThrowback
 - TWRP App log information reduced - epicX67
 - Refresh details after system wipe and adb sideload - AdrianDC