clarify that Redis is required, standardadise on Hookshot with an upper-case first letter for consistency

roles/custom/matrix-bridge-hookshot/defaults/main.yml

@@ -31,7 +31,9 @@ matrix_hookshot_appservice_port: 9993
 matrix_hookshot_appservice_endpoint: "{{ matrix_hookshot_public_endpoint }}/_matrix/app"
 
 # Controls whether the experimental end-to-bridge encryption support is enabled.
-# This requires that support is also enabled in the homeserver, see the hookshot docs.
+# This requires that:
+# - support to also be enabled in the homeserver, see the documentation of Hookshot.
+# - Hookshot to be pointed at a Redis instance via the `matrix_hookshot_queue_*` variables.
 matrix_hookshot_experimental_encryption_enabled: false
 
 # Controls whether metrics are enabled in the bridge configuration.
@@ -45,7 +47,7 @@ matrix_hookshot_metrics_enabled: false
 matrix_hookshot_metrics_proxying_enabled: false
 
 # There is no need to edit ports.
-# Read the documentation to learn about using hookshot metrics with external Prometheus
+# Read the documentation to learn about using Hookshot metrics with external Prometheus
 # If you still want something different, use matrix_hookshot_container_http_host_bind_ports below to expose ports instead.
 matrix_hookshot_metrics_port: 9001