Fix documentation.

Closes #1823.

Author: chriseppstein

compass-style.org/content/help/index.haml

@@ -32,10 +32,10 @@ layout: site
         $ cd /path/to/project
         $ compass watch
 
-    When it comes time to compile your css files for production use, pass the `--production`
+    When it comes time to compile your css files for production use, pass the `-e production`
     compiler option to select defaults that optimize your output for end-users:
 
-        $ compass compile --production
+        $ compass compile -e production
 
     ## Using Compass without the command line tools