Document workaround for aiosqlite savepoints

Document workaround for aiosqlite savepoints

### Description
Update docs with workaround for SAVEPOINT in aiosqlite, based on https://github.com/sqlalchemy/sqlalchemy/discussions/10463

### Checklist
This pull request is:

- [x] A documentation / typographical / small typing error fix
	- Good to go, no issue or tests are needed

Closes: #10491
Pull-request: https://github.com/sqlalchemy/sqlalchemy/pull/10491
Pull-request-sha: 0516c205d2c4c046d449b5684c13a06f813dabe1

Change-Id: I6bb92f18c99f2a53f5488a2d5812781cb2a003b7