docs: make sure list-tests is correctly documented on action.yml

[lucasoares]

No description provided.

[jozefizso]

Thanks a lot for noticing this a fixing the documentation.

[lucasoares]

@jozefizso I noticed that because I'm trying to make the check appear on my pipeline. I have a project with many tests and the summary result is probably bigger than the max allowed check content size, but for some reason it is not working.

In test-reporter documentation says the mode is changed automatically if the size exceeds the maximum allowed size, but this is not happening for me. Even when I tried to set failed to the list-tests, nothing changed, my check is never created, with no error on logs.

Still trying, but I wanted to fix the documentation already haha