small formatting tweaks

Author: philcryer

globals/cache.conf

@@ -2,8 +2,8 @@
 
 #### Suggested by Károly Nagy on a nginx LinkedIn Group discussion
 #### https://www.linkedin.com/groups/nginxglobals-2000893.S.5963371829870546947
-if_modified_since		    off; 
-add_header			        Last-Modified ""; 
+if_modified_since           off; 
+add_header                  Last-Modified ""; 
 etag                        on; 	# etag differs on nginx versions, this is for 1.4.X
 
 #### Cache static files for as long as possible (images, css, js, favicons)