docs: document the Opsgenie "teams" responder type behavior

[multani]

It has been changed in #2685 but the behavior is not really documented:

• teams supports a comma-separated list of teams, through the name fields only
• if the list of teams is empty, no team responders are sent to Opsgenie

[multani]

@simonpasquier Should I amend my last commit to add the signature and fix the DCO workflow?

[simonpasquier]

@multani yes please. The CI failures are suspect and unrelated to your change though.

[multani]

@multani yes please. The CI failures are suspect and unrelated to your change though.

I amended my last commit to include the signature, the DCO check passes now.

[simonpasquier]

I meant the ci/circleci:test failures :)

[multani]

I meant the ci/circleci:test failures :)

Yeah, I figured this out ;) (it seems it doesn't work on main as well)

[multani]

@simonpasquier I just remembered I have this PR open, could we merge it perhaps? :D