Dynamic linking instructions broken for Windows

[Alainx277]

Following the setup guide for fast builds on windows leads to errors when using dynamic linking. There seem to be two issues, which both have the solution of turning off "share-generics" for windows builds (bevyengine/bevy#1126, bevyengine/bevy#1110).

Maybe it would be good to offer a solution in the setup guide, or perhaps even temporarily turn off shared generics in the cargo config template.