Rollup merge of #161889 - maxdexh:ptr-read-ownership, r=ChrisDenton Add link to ownership section in ptr::read docs This one has annoyed me for a while but I never found it worth fixing. One of the safety requirements of `read` is that you handle ownership correctly. All `read`-like functions in the `ptr` module (e.g. `copy`, `read_unaligned`) state that "just like `read`", you have to take care around this, and they link to the section on ownership in the `read` docs. However, `read` does not do so in its own safety requirements, and worse yet, you have to *scroll down* to see the section. Every so often I look at this function and think ownership is missing from the docs, before remembering this. This PR just adds a link to make sure users don't miss this. r? libs
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