An online search for "scientific method" will turn up plenty of articles. Most of them talk about forming a single hypothesis, rather than multiple hypotheses, but I think they are taking for granted the "null hypothesis" which is always present. Ie that your main hypothesis is wrong. They agree that in the scientific method, experiments are more about falsifying hypothesis than about confirming them.

It's fairly easy to imagine and find evidence that supports your hypothesis. It's harder to imagine and find evidence that refutes it, and the result is correspondingly more powerful when you do that.