Update winget install guide (nushell#1993)

* Update winget install guide

* ci skip

* ci skip

Author: hustcer

README.md

@@ -49,7 +49,10 @@ $ nix profile install nixpkgs#nushell
 #### Windows:
 
 ```powershell
+# Install to user scope (by default).
 winget install nushell
+# Machine scope installation (Run as admin).
+winget install nushell --scope machine
 ```
 
 After installing, launch Nu by typing `nu`.

book/hooks.md

@@ -203,7 +203,7 @@ An example for PWD env change hook:
 
 ```nu
 $env.config = ($env.config | upsert hooks.env_change.PWD {|config|
-    let val = ($config | get -i hooks.env_change.PWD)
+    let val = ($config | get -o hooks.env_change.PWD)
 
     if $val == null {
         $val | append {|before, after| print $"changing directory from ($before) to ($after)" }
@@ -314,7 +314,6 @@ $env.config.hooks.command_not_found = {
 }
 ```
 
-
 ### `command_not_found` Hook in _Windows_
 
 The following hook uses the `ftype` command, to find program paths in _Windows_ that might be relevant to the user for `alias`-ing.

book/installation.md

@@ -3,6 +3,7 @@ next:
   text: Default Shell
   link: /book/default_shell.md
 ---
+
 # Installing Nu
 
 There are lots of ways to get Nu up and running. You can download pre-built binaries from our [release page](https://github.com/nushell/nushell/releases), [use your favourite package manager](https://repology.org/project/nushell/versions), or build from source.
@@ -27,7 +28,13 @@ For macOS and Linux, [Homebrew](https://brew.sh/) is a popular choice (`brew ins
 
 For Windows:
 
-- [Winget](https://docs.microsoft.com/en-us/windows/package-manager/winget/) (`winget install nushell`)
+- [Winget](https://docs.microsoft.com/en-us/windows/package-manager/winget/)
+
+  - Machine scope installation: `winget install nushell --scope machine`
+  - Machine scope upgrade: `winget update nushell`
+  - User scope installation: `winget install nushell` or `winget install nushell --scope user`
+  - User scope upgrade: Due to [winget-cli issue #3011](https://github.com/microsoft/winget-cli/issues/3011), running `winget update nushell` will unexpectedly install the latest version to `C:\Program Files\nu`. To work around this, run `winget install nushell` again to install the latest version in the user scope.
+
 - [Chocolatey](https://chocolatey.org/) (`choco install nushell`)
 - [Scoop](https://scoop.sh/) (`scoop install nu`)