Docs for `generate-import-lib` probably need updating

[davidhewitt]

Just noticed the docs still say the feature is "experimental" - it's been around long enough with few reported issues so that's probably not the case any more!

Aside from that, I wonder if we should look making a better example how it should be used with e.g. maturin.

[messense]

Yeah it's been working great for a long time now, I think we can make maturin to enable the feature automatically when cross compiling to Windows when --locked and --frozen are not present.