Mention some additional default settings in the config [#5618].

Signed-off-by: Ben Sturmfels <ben@sturm.com.au>

mediagoblin.example.ini

@@ -23,6 +23,10 @@ email_sender_address = "notice@mediagoblin.example.org"
 # Set to false to enable sending notices
 email_debug_mode = true
 
+# Configure the mail server
+#email_smtp_host = mailhub
+#email_smtp_port = 25
+
 # Set to false to disable registrations
 allow_registration = true
 
@@ -32,6 +36,13 @@ allow_reporting = true
 ## Uncomment this to put some user-overriding templates here
 # local_templates = %(data_basedir)s/templates/
 
+# Change the date format
+#datetime_format = "%I:%M%p %Y-%m-%d"
+
+# Show some more metadata
+#original_date_visible = True
+#exif_visible = True
+
 ## You can set your theme by specifying this (not specifying it will
 ## use the default theme).  Run `gmg assetlink` to apply the change.
 ## The airy and sandyseventiesspeedboat theme comes with GMG; please