Improve wording and description of atomics in the Arc chapter
#430
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I attempted my best to improve my original description of atomics. This removes the giant ugly double-blockquote referencing the Rust
alloccrate, which references the Boost documentation. Please let me know if my descriptions are wrong!I also fixed #323 with this edit; it didn't really make sense anyway to have it be a
*mut ArcInner<T>originally as it wouldn't have been possible to mutate the inner value or the refcount (the refcount can be updated through a shared ref with atomics, anyway). I made sure to keep the description of variance, so the reader understands why that is an important property to retain.