Update docs to mention on Windows

Author: edwin0cheng

docs/user/readme.adoc

@@ -57,7 +57,7 @@ To disable this notification put the following to `settings.json`
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-The server binary is stored in `~/.config/Code/User/globalStorage/matklad.rust-analyzer` (Linux) or in `~/.Library/Application Support/Code/User/globalStorage/matklad.rust-analyzer (macOS)`.
+The server binary is stored in `~/.config/Code/User/globalStorage/matklad.rust-analyzer` (Linux) or in `~/.Library/Application Support/Code/User/globalStorage/matklad.rust-analyzer` (macOS) or in `%APPDATA%\Code\User\globalStorage` (Windows).
 
 Note that we only support the latest version of VS Code.