Rollup merge of #138508 - hkBst:patch-3, r=wesleywiser

Clarify "owned data" in E0515.md

This clarifies the explanation of why this is not allowed and also what to do instead.

Fixes #62071

PS There was suggestion of adding a link to the book. I did not yet do that, but if desired that could be added.

Author: matthiaskrgr