Clarify Copy trait, "l" letter to quoted #2418
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Coming from a Python background, the trait system is still mostly a mystery for me, this wonderful book helping me along in the learning process. My unfamiliarity is why I needed to re-read this section again to see what was meant. A type as being "Copy" as an adjective collides with the common sense word "copy" being either a verb or a noun. Something is a copy of, or you copy from something to something else. The documentation should (I feel) reflect this not to confuse readers (as I was). I'm not sure whether the "ˋCopyˋable" semantics is congruent with Rust traits, having no experience with it, but I think it adds to the readability of this section.
Minor: remove italics to prevent letter "l" to appear as a slash.