Fix typos

roles/matrix-server/tasks/setup_nginx_proxy.yml

@@ -10,7 +10,7 @@
 # It doesn't hurt to put them in place, even if they turn out
 # to be unnecessary.
 #
-- name: Ensure Matrix nginx-proxy paths exists
+- name: Ensure Matrix nginx-proxy paths exist
   file:
     path: "{{ item }}"
     state: directory