Return atomic flag in the upgarde docs

Signed-off-by: Sergey Tarasov <[email protected]>

Author: mynoheart

versioned_docs/version-3/helm/helm_upgrade.md

@@ -51,7 +51,7 @@ helm upgrade [RELEASE] [CHART] [flags]
 ### Options
 
 ```
-      --rollback-on-failure                        if set, upgrade process rolls back changes made in case of failed upgrade. The --wait flag will be set automatically if --rollback-on-failure is used
+      --atomic                                     If set, upgrade process rolls back changes made in case of failed upgrade, also sets --wait flag
       --ca-file string                             verify certificates of HTTPS-enabled servers using this CA bundle
       --cert-file string                           identify HTTPS client using this SSL certificate file
       --cleanup-on-fail                            allow deletion of new resources created in this upgrade when upgrade fails