Document changes from vitessio/vitess#12622

Signed-off-by: Matt Lord <mattalord@gmail.com>

content/en/docs/17.0/reference/vreplication/workflow.md

@@ -7,7 +7,8 @@ weight: 50
 ### Command
 
 ```
-Workflow  -- [--dry_run] <keyspace.workflow> <action>
+Workflow -- [--dry-run] [--cells=<cells>] [--tablet-types=<types>] [--on-ddl=<value>] <keyspace>[.<workflow>] <action>
+
 ```
 
 ### Description
@@ -17,19 +18,44 @@ actually specifying a query to VReplication.
 
 ### Parameters
 
-#### --dry_run
+#### --dry-run
 **optional**\
 **default** false
 
 <div class="cmd">
 You can do a dry run where no actual action is taken but the command logs all the actions that would be taken by the Workflow.
 </div>
 
+#### --cells
+**optional** (Update only)\
+**default** false
+
+<div class="cmd">
+You can update an existing workflow so that a different set of cells and/or cell aliases are used when choosing replication sources.
+</div>
+
+#### --tablet-types
+**optional** (Update only)\
+
+<div class="cmd">
+You can update an existing workflow so that different types of tablets are selected when choosing replication sources (see [tablet selection](../tablet_selection/)).
+</div>
+
+#### --on-ddl
+**optional** (Update only)\
+
+<div class="cmd">
+You can update an existing workflow so that DDL in the replication stream are handled differently (see [tablet selection](../vreplication/#handle-ddl)).
+</div>
+
 #### keyspace.workflow
 **mandatory**
 
 <div class="cmd">
 Name of target keyspace and the associated workflow to take action on.
+{{< note >}}
+The `listall` action is an exception to this rule as with that action you only specify the keyspace.
+{{< /note >}}
 </div>
 
 #### action
@@ -40,6 +66,7 @@ The Action is one of:
 
 * **stop**: sets the state of the workflow to Stopped: no further vreplication will happen until workflow is restarted
 * **start**: restarts a Stopped workflow
+* **update**: updates configuration parameters for this workflow in the `_vt.vreplication` table
 * **delete**: removes the entries for this workflow in the `_vt.vreplication` table
 * **show**: returns a JSON object with details about the associated shards and also with all the columns
     from the `_vt.vreplication` table

content/en/docs/17.0/user-guides/migration/troubleshooting.md

@@ -100,11 +100,7 @@ The following vreplication streams exist for workflow customer.commerce2customer
 
 id=1 on 0/zone1-0000000200: Status: Running. VStream has not started.
 
-
-$ for tablet in $(vtctlclient ListAllTablets -- --keyspace=customer --tablet_type=primary | awk '{print $1}'); do
-    vtctlclient VReplicationExec -- ${tablet} 'update _vt.vreplication set tablet_types="replica,primary" where workflow="commerce2customer"'
-  done
-
+$ vtctlclient Workflow -- --tablet-types="replica,primary" customer.commerce2customer update
 
 $ vtctlclient MoveTables -- Progress customer.commerce2customer