docs: add suggestion for ease of installation

Author: CryptoTotalWar

docs/tutorials/polykey-cli/installation.md

@@ -114,7 +114,7 @@ Download the executable named `...-polykey-cli-V.V.V-darwin-universal`, and rena
 
 :::tip
 
-Make sure to cd into the directory where your Polykey CLI executable is located first.
+Make sure to cd into the directory where your Polykey CLI executable is located first. Typically this would be your Downloads directory.
 
 :::