Remove --standalone from tripleo deploy command

This option was deprecated during Victoria cycle[1] and was removed
during Wallaby cycle[2].

[1] a5381b21694ef8c0ca2f587ea2e58a24a57736e5
[2] 5cbc2b8ef154b269bad8491e7d469c6094514335

Closes-Bug: #1969644
Change-Id: Id17920902028841b951f77a3d262e99d5250ec0d

deploy-guide/source/deployment/standalone.rst

@@ -334,8 +334,7 @@ Deploying a Standalone OpenStack node
       -r /usr/share/openstack-tripleo-heat-templates/roles/Standalone.yaml \
       -e $HOME/containers-prepare-parameters.yaml \
       -e $HOME/standalone_parameters.yaml \
-      --output-dir $HOME \
-      --standalone
+      --output-dir $HOME
 
    .. admonition:: Ceph
       :class: ceph
@@ -354,8 +353,7 @@ Deploying a Standalone OpenStack node
            -e $HOME/containers-prepare-parameters.yaml \
            -e $HOME/standalone_parameters.yaml \
            -e $HOME/deployed_ceph.yaml \
-           --output-dir $HOME \
-           --standalone
+           --output-dir $HOME
 
 
 #. Check the deployed OpenStack Services
@@ -1004,8 +1002,7 @@ Deploy the second node with the following:
         -e $HOME/export_control_plane/all-nodes-extra-map-data.json \
         -e $HOME/export_control_plane/extra-host-file-entries.json \
         -e $HOME/export_control_plane/oslo.yaml \
-        --output-dir $HOME \
-        --standalone
+        --output-dir $HOME
 
 The example above assumes that ``export_control_plane`` is the name
 of the directory which contains the content extracted from the