book: clarify value category is a property of expressions#311
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The lvalue/rvalue section defined value categories in terms of objects, which obscures the fundamental point that value category is a property of expressions (each expression is exactly one of lvalue/prvalue/xvalue). Add a clarifying note citing cppreference while keeping the intuitive descriptions as labeled approximations. Also fix pvalue -> prvalue typo. Fixes #275
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The lvalue/rvalue section defined value categories in terms of objects, obscuring that value category is a property of expressions (each expression is exactly one of lvalue/prvalue/xvalue). Add a clarifying note citing cppreference while keeping the intuitive descriptions as labeled approximations. Also fix a
pvalue→prvaluetypo.Fixes #275