Update Synapse configuration for v1.12.0

Some options are no longer required and have sensible default values.

roles/matrix-synapse/templates/synapse/homeserver.yaml.j2

@@ -1358,6 +1358,25 @@ saml2_config:
   #
   #grandfathered_mxid_source_attribute: upn
 
+  # Directory in which Synapse will try to find the template files below.
+  # If not set, default templates from within the Synapse package will be used.
+  #
+  # DO NOT UNCOMMENT THIS SETTING unless you want to customise the templates.
+  # If you *do* uncomment it, you will need to make sure that all the templates
+  # below are in the directory.
+  #
+  # Synapse will look for the following templates in this directory:
+  #
+  # * HTML page to display to users if something goes wrong during the
+  #   authentication process: 'saml_error.html'.
+  #
+  #   This template doesn't currently need any variable to render.
+  #
+  # You can see the default templates at:
+  # https://github.com/matrix-org/synapse/tree/master/synapse/res/templates
+  #
+  #template_dir: "res/templates"
+
 
 
 # Enable CAS for registration and login.
@@ -1508,10 +1527,6 @@ email:
   # https://github.com/matrix-org/synapse/tree/master/synapse/res/templates
   #
   #template_dir: "res/templates"
-  notif_template_html: notif_mail.html
-  notif_template_text: notif_mail.txt
-  expiry_template_html: notice_expiry.html
-  expiry_template_text: notice_expiry.txt
 {% endif %}