Missing hyphen in git-http-backend

Add missing hyphen in the command name.

Author: paveljanik

book/04-git-server/sections/smart-http.asc

@@ -16,7 +16,7 @@ $ a2enmod cgi alias env
 
 This also enables the `mod_cgi`, `mod_alias`, and `mod_env` modules, which are all needed for this to work properly.
 
-Next we need to add some things to the Apache configuration to run the `git http-backend` as the handler for anything coming into the `/git` path of your web server.
+Next we need to add some things to the Apache configuration to run the `git-http-backend` as the handler for anything coming into the `/git` path of your web server.
 
 [source,console]
 ----