Add info on logical lines

[KyleMit]

This issue was raised in #26393 and fixed in #135805.

It got a shout out in the October 2021 release notes, but was never documented anywhere on the site.

Since it's not configured via a setting, has even less discoverability that someone would know to add this specific command to the keybind args.

Also asked about on Stack Overflow How to avoid multi cursor on wrapped lines in VS Code?