Commits on Apr 23, 2020

1. Document nested transactions with SAVEPOINTs …

   Fixes #5953.
   
   Summary of changes:
   
   - Update SAVEPOINT page with more examples of "generalized" aka "nested"
     savepoints adapted from the RFC, in addition to the existing "retry"
     savepoints info
   
   - Add a new SHOW SAVEPOINT STATUS statement page (with syntax diagram),
     and add it to the sidebar
   
   - Update RELEASE SAVEPOINT docs to clarify "retry" savepoints
     vs. "generalized/nested" savepoints, and update the examples as well
   
   - Update the ROLLBACK docs to mention rollbacks to savepoints more
     explicitly.  Also, update the diagram to reflect that
     'cockroach_restart' is no longer the only allowed savepoint name.
   
   - Add information on how CockroachDB handles savepoints and locking
     vs. Postgres
   
   - Add a new "nested transactions" section to the 'Transactions' page,
     including:
   
     - A brief description of why nested transactions are useful
   
     - A description of how COMMIT, ROLLBACK, RELEASE SAVEPOINT, and
       ROLLBACK TO SAVEPOINT relate to each other
   
   - Draw distinctions in several places between "retry" savepoints and
     "nested" or "generalized" savepoints, since they are different
   
   - Update mentions of savepoints on 'SQL Statements' and 'Postgres
     Compatibility' to note that they are supported now

   

   rmloveland committed Apr 23, 2020
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