Fix 'email_address' being typoed as 'email_addres' in two places

### Description
Fixes a typo that coincidentally occurs in a couple of different places - once in the docs, and another time in a test, where it was presumably neutering one of the test's assertions by making it always pass.

### Checklist
<!-- go over following points. check them with an `x` if they do apply, (they turn into clickable checkboxes once the PR is submitted, so no need to do everything at once)

-->

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: #5358
Pull-request: https://github.com/sqlalchemy/sqlalchemy/pull/5358
Pull-request-sha: 8a6e64323abeb9d08de3f68c63c6401ba1a5f847

Change-Id: I667657ee2d1d67b142f025257da7953a51c2ab7f