Merge pull request #230 from percona/patrickbirch-patch-1

Update wsrep-system-index.md

Author: patrickbirch

docs/wsrep-system-index.md

@@ -1254,11 +1254,11 @@ Defines storage for streaming replication fragments. The available values are `t
 | Config File:   | Yes                |
 | Scope:         | Global            |
 | Dynamic:       | No                 |
-| Default Value: | ``xtrabackup-v2`, `clone`` |
+| Default Value: | ``xtrabackup-v2, clone`` |
 
 Percona XtraDB Cluster 8.4.4-1 adds `clone` to the default value. For older versions of Percona XtraDB Cluster, the default value is `xtrabackup-v2`.
 
-This variable limits SST methods accepted by the server for [wsrep_sst_method](#wsrep_sst_method) variable. The default value is `xtrabackup-v2`.
+This variable limits SST methods accepted by the server for [wsrep_sst_method](#wsrep_sst_method) variable. The default value is `xtrabackup-v2` or `clone`.
 
 ### `wsrep_sst_donor`
 
@@ -1325,22 +1325,13 @@ Defines the method or script for [State Snapshot Transfer](state-snapshot-transf
 
 Available values are:
 
-* `xtrabackup-v2`: Uses *Percona XtraBackup* to perform SST. This value is the default.
-Privileges and permissions for running *Percona XtraBackup*
+* `xtrabackup-v2`: Uses Percona XtraBackup to perform SST. This value is the default.
+Privileges and permissions for running Percona XtraBackup
 can be found in [Percona XtraBackup documentation](https://docs.percona.com/percona-xtrabackup/8.0/privileges.html). For more information, see [Percona XtraBackup SST Configuration](xtrabackup-sst.md#xtrabackup-sst). The `xtrabackup-v2` method supports clusters with GTIDs and async replicas.
 
 * `clone`: Introduced in Percona XtraDB Cluster 8.4.4-4, uses the [clone method for SST](clone-sst.md). 
 
-* `skip`: Use this to skip SST.
-**Removed in Percona XtraDB Cluster 8.0.33-25.** This value can be used when initially starting the cluster
-and manually restoring the same data to all nodes.
-This value should not be used permanently because it could lead to data inconsistency across the nodes.
-
-* `ist_only` : **Introduced in Percona XtraDB Cluster 8.0.33-25.** This value allows only Incremental State Transfer (IST). If a node cannot sync with the cluster with IST, abort that node's start. This action leaves the data directory unchanged. This value prevents starting a node, after a manual backup restoration, that does not have a `grastate.dat` file. This missing file could initiate a full-state transfer (SST) which can be a more time and resource-intensive operation.
-
-!!! note
-
-    ``xtrabackup-v2`` provides support for clusters with GTIDs and async replicas.
+* `ist_only`: This value allows only Incremental State Transfer (IST). If a node cannot sync with the cluster with IST, abort that node's start. This action leaves the data directory unchanged. This value prevents starting a node that does not have a `grastate.dat` file after a manual backup restoration. This missing file could initiate a full-state transfer (SST), which can be more time- and resource-intensive.
 
 !!! admonition "See also"