Fix misuse of *usage* throughout the Reference#2222
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*Usage* means a customary pattern of use (as in "regional usage varies") or a rate or quantity of use (as in "disk usage"). It doesn't mean *use*. Whenever *use* works, *usage* shouldn't appear. Let's fix each incorrect use of *usage* -- i.e., adopt better *usage* of *usage* -- throughout the prose of the Reference.
In the prior commit, we fixed prose occurrences of *usage*. The same reasoning applies to the rule identifiers. These rules describe where the language permits a construct to appear. On the surface, that may seem to be a kind of pattern of use, but it's not (in the sense implied by *usage*), and ultimately *use* is still the right word. The word *usage* describes conventions and customs -- i.e., *customary* patterns of use. It describes how a community uses something and how that varies, e.g., across regions. That's not what we're doing here. We're not describing better or worse Rust idioms. There's no "nonstandard usage" of Rust grammatical constructs -- that's not what we're defining, at least. Let's fix each rule identifier to use `use` instead. (None of these identifiers were referenced elsewhere in the Reference.)
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Usage means a customary pattern of use (as in "regional usage varies") or a rate or quantity of use (as in "disk usage"). It doesn't mean use. Whenever use works, usage shouldn't appear.
Let's fix each incorrect use of usage -- i.e., adopt better usage of usage -- throughout the Reference.
cc @ehuss