Fix inline and docblock comments in core that uses "Url" in sentences

I think the scope needs a little refinement here -- the goal is not to change the ones that are not related to URL objects. The goal is to decide whether vague, un-namespaced references to Url in docs should use the English word instead of the class name. So I don't think the regex is quite right; it should be checking for a * or // literal on the same line

Marking postponed on 📌 Correctly capitalize "url" in documentation only, part 2 Fixed .

Fixing attribution.