Fix typo

roles/matrix-grafana/defaults/main.yml

@@ -22,7 +22,7 @@ matrix_grafana_data_path: "{{ matrix_grafana_base_path }}/data"
 # Allow viewing Grafana without logging in
 matrix_grafana_anonymous_access: false
 
-# Allow `false`, sends a `X-Frame-Options: deny` HTTP header, which allows Grafana from being embeded in a frame.
+# When `false`, sends a `X-Frame-Options: deny` HTTP header, which allows Grafana from being embeded in a frame.
 # Read more here: https://grafana.com/docs/grafana/latest/administration/configuration/#allow_embedding
 matrix_grafana_allow_embedding: false