Add results value of uncertainty

https://www.cleverpm.com/2018/08/23/accepting-uncertainty-is-the-key-to-agility/ is found in https://about.gitlab.com/job-families/product/product-manager/index.html

My thinking here is that this might deserve a place on the company values list under "results" in order to align all our thoughts this way. It's an addition to the bias for action and also explains why we essentially prefer breadth over depth...

@bikebilly let me know if this something you think benefits everyone 🤔