Docs: simplify language in getting a connection & committing changes

Docs: simplify language in getting a connection & committing changes

### Description
Simplifies language use in [Getting a Connection](https://docs.sqlalchemy.org/en/20/tutorial/dbapi_transactions.html#getting-a-connection) and [Committing Changes](https://docs.sqlalchemy.org/en/20/tutorial/dbapi_transactions.html#committing-changes)

### Checklist
This pull request is:

- [x] A documentation / typographical / small typing 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: #11542
Pull-request: https://github.com/sqlalchemy/sqlalchemy/pull/11542
Pull-request-sha: d706e69fb6058d3483fce98cfacbbf36ca12d78e

Change-Id: I7788f2a16a5127b3c9623f7b00f06f649b04e0fb