reference/configuration: add tidb_row_format_version (#2605) #2770
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yikeke
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Apr 15, 2020
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cherry-pick #2605 to release-4.0
What is changed, added or deleted? (Required)
add description for new variable
tidb_row_format_versionin TiDB 4.0，we use a new row format (v2) to save table data and we also add sysvar to control whether write new data as the new format (or rollback to write new data as old format)
Which TiDB version(s) do your changes apply to? (Required)
If you select two or more versions from above, to trigger the bot to cherry-pick this PR to your desired release version branch(es), you must add corresponding labels such as needs-cherry-pick-3.1, needs-cherry-pick-3.0, and needs-cherry-pick-2.1.
What is the related PR or file link(s)?
This change is