Rollup merge of #66710 - vorner:weak-into-raw-null-docs, r=dtolnay
weak-into-raw: Clarify some details in Safety Clarify it is OK to pass a pointer that never owned a weak count (one from Weak::new) back into it as it was created from it. Relates to discussion in #60728. @CAD97 Do you want to have a look at the new docs?
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