Document using Signal nicknames

roles/custom/matrix-bridge-mautrix-signal/defaults/main.yml

@@ -57,6 +57,7 @@ matrix_mautrix_signal_command_prefix: "!signal"
 # Displayname template for Signal users.
 # {{.ProfileName}} - The Signal profile name set by the user.
 # {{.ContactName}} - The name for the user from your phone's contact list. This is not safe on multi-user instances.
+# {{.Nickname}} - The nickname set for the user in the native Signal app. This is not safe on multi-user instances.
 # {{.PhoneNumber}} - The phone number of the user.
 # {{.UUID}} - The UUID of the Signal user.
 # {{.AboutEmoji}} - The emoji set by the user in their profile.