Auto merge of #68659 - Dylan-DPC:rollup-zo7zi9f, r=Dylan-DPC

Rollup of 6 pull requests

Successful merges:

 - #66648 (Implement clone_from for BTreeMap and BTreeSet)
 - #68468 (BTreeMap: tag and explain unsafe internal functions or assert preconditions)
 - #68626 (Use termize instead of term_size)
 - #68640 (Document remaining undocumented `From` implementations for IPs)
 - #68651 (Document `From` implementation for NonZero nums)
 - #68655 (Fix revision annotations in borrowck-feature-nll-overrides-migrate)

Failed merges:

r? @ghost