Remove 1 depth of heading

This "Change" section doesn't bring much and look especially weird in
short release notes.

wiki/src/contribute/how/documentation/release_notes/template.mdwn

@@ -20,15 +20,13 @@ vulnerabilities|security/Numerous_security_holes_in_$VERSION-1]]. You should upg
 
 [[!toc levels=1]]
 
-# Changes
+# New features
 
-## New features
-
-## Upgrades and changes
+# Upgrades and changes
 
 <-- You can reuse the following subsections if the section gets too big:
 
-### Included software
+## Included software
 
 - Update *Xyz* to [1.2.3].
 
@@ -37,14 +35,14 @@ vulnerabilities|security/Numerous_security_holes_in_$VERSION-1]]. You should upg
 - Update *Linux* to 1.2.3. This should improve the support for newer
   hardware (graphics, Wi-Fi, etc.).
 
-### Hardware support
+## Hardware support
 
 The following updates make Tails work better on recent hardware (graphics,
 Wi-Fi, etc.):
 
 -->
 
-## Fixed problems
+# Fixed problems
 
 For more details, read our [[!tails_gitweb debian/changelog desc="changelog"]].