### Description
The goal is to annotate postgresql specific apis that are under postgresql/dml.py file.
I've looked around to see what types are used for similar apis, hope I got it right :)
### Checklist
This pull request is:
- [x] A documentation / typographical error fix
- Good to go, no issue or tests are needed
- [ ] A short code fix
- please include the issue number, and create an issue if none exists, which
must include a complete example of the issue. one line code fixes without an
issue and demonstration will not be accepted.
- Please include: `Fixes: #<issue number>` in the commit message
- please include tests. one line code fixes without tests will not be accepted.
- [ ] A new feature implementation
- please include the issue number, and create an issue if none exists, which must
include a complete example of how the feature would look.
- Please include: `Fixes: #<issue number>` in the commit message
- please include tests.
**Have a nice day!**
Closes: #10021
Pull-request: https://github.com/sqlalchemy/sqlalchemy/pull/10021
Pull-request-sha: 0562f09397
Change-Id: I142f8929505c0263fcf45072d888df7ae81e6e85
Mike Bayer