Explicitly mention in the docs that grow, grow_zeroed, and shrink have to handle changes in alignment #97
Description
The docs currently imply that the alignment of new_layout may be different from that of old_layout by not stating otherwise. Reallocations with altered alignments are extremely uncommon; I had to track down #5 in this repository to convince myself this wasn't a mistake. This could be a pitfall for implementors of Allocator if it's not made more explicit.