Information was added to a markdown file in https://github.com/bitcoin/bitcoin/pull/28974:
But despite concerns (https://github.com/bitcoin/bitcoin/pull/28974#issuecomment-1855661692) never made it to the GUI:
<img width="759" height="322" alt="Wallet passphrase entry" src="https://github.com/user-attachments/assets/69b21159-dbca-46db-9184-24041b73a3e9" />
The current phrasing dates back to 2011 when wallet key encryption was added in 4e87d341f75f13bbd7d108c31c03886fbc4df56f.
This topic came up while working on https://github.com/bitcoin/bitcoin/pull/36200 Related: https://github.com/bitcoin/bitcoin/issues/18085