Forgot backtick

Change-Id: I1b326645492338010c1d0804dbabfdfb05f6dc5c
(cherry picked from commit 68f44e21b0134db072c507f8d29d6b952d813506)
diff --git a/INSTALL_SINGLE_NODE.md b/INSTALL_SINGLE_NODE.md
index e252a83..47d2477 100644
--- a/INSTALL_SINGLE_NODE.md
+++ b/INSTALL_SINGLE_NODE.md
@@ -76,7 +76,7 @@
 ## Prepare the configuration file
 
 Edit the configuration file `/cord/components/platform-install/config/default.yml`.  Add the IP address of your target
-server as well as the `username / password for accessing the server.  You can skip adding the password if you can SSH 
+server as well as the `username / password` for accessing the server.  You can skip adding the password if you can SSH
 to the target server from inside the Vagrant VM as `username` without one (e.g., by running `ssh-agent`).
 
 If your target server is a CloudLab machine, uncomment the following two lines in the