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1b9f420e1b
Try to clarify GlobalAlloc::realloc documentation comment. This PR tries to improve the documentation of [GlobalAlloc::realloc](https://doc.rust-lang.org/alloc/alloc/trait.GlobalAlloc.html#method.realloc) with two aspects: 1. Explicitly mention that `realloc` preserves the contents of the original memory block. 2. Explicitly mention which layout should be used to deallocate the reallocated block.