add even more headers

Author: SethTisue

_posts/2025-03-05-next-scala-lts-jdk.md

@@ -10,9 +10,13 @@ Scala 3 compiler. We now thank everyone for their input and announce the
 decision to switch to JDK 17 as the new minimum, starting with Scala 3.8 minor
 and the subsequent new LTS which will mostly likely be Scala 3.9.
 
+## Why drop 8?
+
 Our reasoning for dropping 8 was presented in this [previous blog
 post](https://www.scala-lang.org/blog/next-scala-lts.html).
 
+## Why drop 11?
+
 The discussion on whether to also drop 11 didn't uncover any compelling reason not to leave JDK 11 behind.
 11 is now nearly as antiquated as 8, and moving from 11 to 17 is not normally considered a
 difficult upgrade for users. 17 offers useful APIs and VM features. In the JVM