Remove irrelevant instruction

Signed-off-by: Suguru Hirahara <did🔑z6MkvVZk1A3KBApWJXv2Ju4H14ErDfRGxh8zxdXSZ4vACDg5>

docs/configuring-playbook-bridge-zulip.md

@@ -28,9 +28,6 @@ matrix_bridge_zulip_enabled: true
 # Setting the owner is optional as the first local user to DM `@matrixzulipbridge:example.com` will be made the owner.
 # If you are not using a local user you must set it as otherwise you can't DM it at all.
 matrix_bridge_zulip_owner: "@alice:{{ matrix_domain }}"
-
-# Uncomment to enable identd on host port 113/TCP (optional)
-# matrix_bridge_zulip_identd_enabled: true
 ```
 
 ### Adjusting the MatrixZulipBridge URL (optional)