docs(asdf): update usage example (#13055)

plugins/asdf/README.md

@@ -21,19 +21,28 @@ Example for installing the nodejs plugin and the many runtimes for it:
 # Add plugin to asdf
 asdf plugin add nodejs
 
-# Install the latest available nodejs runtime version
+# Install the latest available version
 asdf install nodejs latest
 
-# Install nodejs v16.5.0 runtime version
+# Uninstall the latest version
+asdf uninstall nodejs latest
+
+# Install a specific version
 asdf install nodejs 16.5.0
 
-# Set the latest version in .tools-version in the current working directory
+# Set the latest version in .tool-versions of the `current directory`
 asdf set nodejs latest
 
-# Set a version globally that will apply to all directories under $HOME
-asdf set -u nodejs 16.5.0
+# Set a specific version in the `parent directory`
+asdf set -p nodejs 16.5.0   # -p is shorthand for --parent
+
+# Set a global version under `$HOME`
+asdf set -u nodejs 16.5.0   # -u is shorthand for --home
 ```
 
+For more commands, run `asdf help` or refer to the
+[asdf CLI documentation](https://asdf-vm.com/manage/commands.html#all-commands).
+
 ## Maintainer
 
 - [@RobLoach](https://github.com/RobLoach)