dev-doc: Make header size consistent in dev-env

Change-Id: I2c7d7841f4f4e4ca9f7d4d692e44d6920b54587b
Signed-off-by: Andrew Geissler <geissonator@yahoo.com>
diff --git a/development/dev-environment.md b/development/dev-environment.md
index b4c0d94..3fb779f 100644
--- a/development/dev-environment.md
+++ b/development/dev-environment.md
@@ -6,7 +6,7 @@
 
 **Prerequisites:** Current Linux, Mac, or Windows system
 
-### Overview
+## Overview
 
 OpenBMC uses the [Yocto](https://www.yoctoproject.org/) Project as its
 underlying building and distribution generation framework. The main
@@ -32,7 +32,7 @@
 For testing purposes, this guide uses the Romulus system as the default because
 this is the system tested for each CI job, which means it's the most stable.
 
-### Install Linux Environment
+## Install Linux Environment
 
 If you are running Linux, and are ok with installing some additional packages,
 then you can skip to step 3.
@@ -75,7 +75,7 @@
   **Note** - In Ubuntu, a "sudo apt-get update" will probably be needed before
   installing the packages.
 
-### Download and Start QEMU Session
+## Download and Start QEMU Session
 
 1. Download latest openbmc/qemu fork of QEMU application
 
@@ -118,7 +118,7 @@
 
     **Note** To exit (and kill) your QEMU session run: `ctrl+a x`
 
-### Download and Install SDK
+## Download and Install SDK
 
 To keep things organized, create a directory to store your SDK install scripts
 and directories.