Demonstrate state as optional in controller guidelines

[mcmire]

Explanation

In various examples in the controller guidelines, the state controller option was not optional, even though there is a guideline that says it should be. This commit updates the documentation so that it shown as optional.

References

I discovered that the examples were incorrect when reviewing this PR.

Changelog

N/A

Checklist

• I've updated the test suite for new or updated code as appropriate
• I've updated documentation (JSDoc, Markdown, etc.) for new or updated code as appropriate
• I've highlighted breaking changes using the "BREAKING" category above as appropriate
• I've prepared draft pull requests for clients and consumer packages to resolve any breaking changes