fix(health-checks): cors origin doesn't accept empty args

[timdeschryver]

This PR doesn't resolve an issue, but it addresses a small mistake in the docs. As shown in the image below, RequireCors requires us to pass a builder, or a policy name. The method gives a compile error when no arguments are provided, but the docs mention that it should be possible.

Link to the source code with the allowed signatures.

[Rick-Anderson]

@FirstAfterGod2501 please review

[Rick-Anderson]

@timdeschryver thanks for your contribution. Be sure to check out your name as a contributor about the 3rd of next month on the What's new page in the Community contributors section at the bottom.

[timdeschryver]

Cool, thanks @Rick-Anderson !