docgen: update savepoint-related definitions, bnfs #46048
Merged
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This change updates the syntax diagram definitions and generated BNF for
several SAVEPOINT-related statements, specifically:
Add the SHOW SAVEPOINT STATUS statement to the list of syntax diagrams
generated by pkg/cmd/docgen
Add the SHOW SAVEPOINT STATUS BNF file to the other generated BNF
files
Update ROLLBACK TO SAVEPOINT to note that the savepoint name does not
have to be 'cockroach_restart'
It uses the changes in #45794, which enabled docgen for SHOW SAVEPOINT
STATUS.
It is part of the work surrounding #45566, which added preliminary SQL
savepoints support.
Release justification: low-risk update to documentation diagrams
Release note: None