Docs: --incremental_from_pos does not require 'MySQL56/' prefix

Signed-off-by: Shlomi Noach <2607934+shlomi-noach@users.noreply.github.com>

content/en/docs/18.0/user-guides/operating-vitess/backup-and-restore/creating-a-backup.md

@@ -106,9 +106,13 @@ An incremental backup requires additional information: the point from which to s
 ```sh
 vtctlclient -- Backup --incremental_from_pos="MySQL56/0d7aaca6-1666-11ee-aeaf-0a43f95f28a3:1-53" zone1-0000000102
 
+vtctlclient -- Backup --incremental_from_pos="0d7aaca6-1666-11ee-aeaf-0a43f95f28a3:1-53" zone1-0000000102
+
 vtctlclient -- Backup --incremental_from_pos="auto" zone1-0000000102
 ```
 
+When indicating a position, you may choose to use or to omit the `MySQL56/` prefix (which you can find in the backup manifest's Position).
+
 When `--incremental_from_pos="auto"`, Vitess chooses the position of the last successful backup as the starting point for the incremental backup. This is a convenient way to ensure a sequence of contiguous incremental backups.
 
 An incremental backup backs up one or more MySQL binary log files. These binary log files may begin with the requested position, or with an earlier position. They will necessarily include the requested position. When the incremental backup begins, Vitess rotates the MySQL binary logs on the tablet, so that it does not back up an active log file.