docs: update section of Windows package CLI (#1172)
docs: update section of Windows package CLI (#1172)

We modified the [build script](https://github.com/Jigsaw-Code/outline-client/pull/1172#issue-840507797) before. In this PR, I updated the corresponding documentation. 
Jigsaw-Code/outline-client,Jigsaw-Code/outline-client,Jigsaw-Code/outline-client,Jigsaw-Code/outline-client,Jigsaw-Code/outline-client,Jigsaw-Code/outline-client,Jigsaw-Code/outline-client,Jigsaw-Code/outline-client,Jigsaw-Code/outline-client,Jigsaw-Code/outline-client