doc: Update WSGI section

Change-Id: Iaefe12e7fdeddb0fb6fe272cd4df3ce46470cc28
Signed-off-by: Stephen Finucane <stephenfin@redhat.com>
diff --git a/stackrc b/stackrc
index ab1f8a6..33c18ce 100644
--- a/stackrc
+++ b/stackrc
@@ -85,7 +85,7 @@
 # Global toggle for enabling services under mod_wsgi. If this is set to
 # ``True`` all services that use HTTPD + mod_wsgi as the preferred method of
 # deployment, will be deployed under Apache. If this is set to ``False`` all
-# services will rely on the local toggle variable (e.g. ``KEYSTONE_USE_MOD_WSGI``)
+# services will rely on the local toggle variable.
 ENABLE_HTTPD_MOD_WSGI_SERVICES=True
 
 # Set the default Nova APIs to enable