Added comments in .htacces to help configuring installation behind a VirtualDocumantRoot

.htaccess

@@ -15,6 +15,16 @@ Deny from all
   # Also place auth information into REMOTE_USER for sites running
   # in CGI mode.
 
+  # If you have troubles or use VirtualDocumentRoot
+  # uncomment this and set it to the path where your friendica installation is
+  # i.e.:
+  # Friendica url: http://some.example.com
+  # RewriteBase /
+  # Friendica url: http://some.example.com/friendica
+  # RewriteBase /firendica/
+  #
+  #RewriteBase /
+
   RewriteCond %{REQUEST_FILENAME} !-f
   RewriteCond %{REQUEST_FILENAME} !-d
   RewriteRule ^(.*)$ index.php?q=$1 [E=REMOTE_USER:%{HTTP:Authorization},L,QSA]