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Clarify ES.48 enforcement rule for void cast of [[nodiscard]] (#1588)

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@ -11707,7 +11707,7 @@ Casts are widely (mis) used. Modern C++ has rules and constructs that eliminate
##### Enforcement
* Force the elimination of C-style casts, except on a function with a `[[nodiscard]]` return.
* Force the elimination of C-style casts, except when casting a `[[nodiscard]]` function return value to void.
* Warn if there are many functional style casts (there is an obvious problem in quantifying 'many').
* The [type profile](#Pro-type-reinterpretcast) bans `reinterpret_cast`.
* Warn against [identity casts](#Pro-type-identitycast) between pointer types, where the source and target types are the same (#Pro-type-identitycast).