sql-statements: use EBNF to render syntax diagrams for BACKUP and RESTORE (#4342) #4350
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cherry-pick #4342 to release-4.0
What is changed, added or deleted? (Required)
Change the synopsis sections of BACKUP, RESTORE and SHOW {BACKUPS|RESTORES} to use the
```ebnf+diagrmblock introduced since pingcap/website-docs#83, replacing the original image-based sqlgrams (which files are deleted).Output preview
The syntax diagrams are now rendered server-side as SVG when building (similar to SQLite3 / IBM DB2 / CockroachDB's docs), and user can also toggle between syntax diagram and the source EBNF (similar to Oracle's docs).
Which TiDB version(s) do your changes apply to? (Required)
What is the related PR or file link(s)?
Do your changes match any of the following descriptions?