Add runtime `xcopy` command on powershell in docs (#2958)

README.md

@@ -49,10 +49,11 @@ tree-sitter grammars may be manually fetched and built with `hx --grammar fetch`
 Helix also needs its runtime files so make sure to copy/symlink the `runtime/` directory into the
 config directory (for example `~/.config/helix/runtime` on Linux/macOS, or `%AppData%/helix/runtime` on Windows).
 
-| OS        | command   |
-|-----------|-----------|
-|windows    |`xcopy runtime %AppData%/helix/runtime`|
-|linux/macos|`ln -s $PWD/runtime ~/.config/helix/runtime`
+| OS                | command   |
+|-------------------|-----------|
+|windows(cmd.exe)   |`xcopy runtime %AppData%/helix/runtime`     |
+|windows(powershell)|`xcopy runtime $Env:AppData\helix\runtime`  |
+|linux/macos        |`ln -s $PWD/runtime ~/.config/helix/runtime`|
 
 This location can be overridden via the `HELIX_RUNTIME` environment variable.
 

book/src/install.md

@@ -61,10 +61,11 @@ Helix also needs it's runtime files so make sure to copy/symlink the `runtime/`
 config directory (for example `~/.config/helix/runtime` on Linux/macOS). This location can be overridden
 via the `HELIX_RUNTIME` environment variable.
 
-| OS        | command   |
-|-----------|-----------|
-|windows    |`xcopy runtime %AppData%/helix/runtime`|
-|linux/macos|`ln -s $PWD/runtime ~/.config/helix/runtime`
+| OS                | command   |
+|-------------------|-----------|
+|windows(cmd.exe)   |`xcopy runtime %AppData%/helix/runtime`     |
+|windows(powershell)|`xcopy runtime $Env:AppData\helix\runtime`  |
+|linux/macos        |`ln -s $PWD/runtime ~/.config/helix/runtime`|
 
 ## Finishing up the installation