Add missing document start to matrix-appservice-double-puppet/defaults/main.yml

roles/custom/matrix-appservice-double-puppet/defaults/main.yml

@@ -1,3 +1,5 @@
+---
+
 matrix_appservice_double_puppet_enabled: true
 
 matrix_appservice_double_puppet_base_path: "{{ matrix_base_data_path }}/appservice-double-puppet"