Merge pull request #271 from percona/patrickbirch-patch-1

Update server-backup-version-comparison.md

docs/server-backup-version-comparison.md

@@ -14,29 +14,34 @@ XtraBackup version that is equal to or above your source server version.
 With the release of Percona XtraBackup 8.0.34-29, Percona XtraBackup allows backups on version 8.0.35 and higher. 
 
 Percona XtraBackup 8.0.21 adds the `--no-server-version-check` option.
+
+## Version check
+
 Before the backup starts, XtraBackup compares the source system version to
 the Percona XtraBackup version. If the source system version is greater than the XtraBackup version, XtraBackup stops the backup and returns an
 error message. This comparison prevents a failed or corrupted
 backup due to source system changes.
 
 The parameter checks for the following scenarios:
 
-* The source system and the PXB version are the same; the backup proceeds
+* The source system and the Percona XtraBackup version are the same; the backup proceeds
+
+* The source system is less than the Percona XtraBackup version, the backup proceeds
+
+* The source system is greater than the Percona XtraBackup version, and the parameter is not overridden; the backup is stopped and returns an error message
 
-* The source system is less than the PXB version, the backup proceeds
+* The source system is greater than the Percona XtraBackup version, and the parameter is  overridden; the backup proceeds
 
-* The source system is greater than the PXB version, and the parameter is not overridden; the backup is stopped and returns an error message
 
-* The source system is greater than the PXB version, and the parameter is  overridden; the backup proceeds
+### Override check
 
-Explicitly adding the `--no-server-version-check` parameter, like the
-example overrides the parameter, and the backup proceeds.
+Explicitly adding the `--no-server-version-check` option overrides the parameter, and the backup proceeds.
 
 ```{.bash data-prompt="$"}
 $ xtrabackup --backup --no-server-version-check --target-dir=$mysql/backup1
 ```
 
-When you override the parameter, the following events can happen:
+Using this option may cause the following events:
 
 * Backup fails