Escape EOLs in apt-get command. Also wrap tighter.

Change-Id: I35fedc39efc10905e7dfece92c3ea3568b6aaa5d
diff --git a/src/source/initializing.md b/src/source/initializing.md
index 6f1bd80..074daa8 100644
--- a/src/source/initializing.md
+++ b/src/source/initializing.md
@@ -66,9 +66,10 @@
 
 To set up your development environment, install the following required packages:
 
-    $ sudo apt-get install git-core gnupg flex bison gperf build-essential zip curl zlib1g-dev libc6-dev
-      lib32ncurses5-dev ia32-libs x11proto-core-dev libx11-dev lib32readline5-dev lib32z-dev libgl1-mesa-dev
-      g++-multilib
+    $ sudo apt-get install git-core gnupg flex bison gperf build-essential \
+      zip curl zlib1g-dev libc6-dev lib32ncurses5-dev ia32-libs \
+      x11proto-core-dev libx11-dev lib32readline5-dev lib32z-dev \
+      libgl1-mesa-dev g++-multilib
 
 ## Configuring USB Access ##