Update stored proc yaml example for driver info

[nmuesch]

What does this PR do?

Clarifies that the stored proc functionality won't work with the pyodbc driver. (adodbapi is the default)

Motivation

Pyodbc doesn't implement the callproc method so using stored procedures when that implementation is chosen in the conf.yaml won't work.

Testing Guidelines

An overview on testing
is available in our contribution guidelines.

Versioning

• Bumped the check version in manifest.json
• Bumped the check version in datadog_checks/{integration}/__init__.py
• Updated CHANGELOG.md. Please use Unreleased as the date in the title
  for the new section.
• If PR impacts documentation, docs team has been notified or an issue has been opened on the documentation repo

Additional Notes

Anything else we should know when reviewing?