fix: instruct people to restart their terminals

modifying shell rc files don't have immediate effect and it's confusing
if you don't know this.

docs/operators/tutorial.md

@@ -82,7 +82,8 @@ abra -h
 ```
 
 You may need to add the `~/.local/bin/` directory to your `$PATH` variable, in
-order to run the executable.
+order to run the executable. Also, run this line into your terminal so
+you have immediate access to `abra` on the current terminal.
 
 ```bash
 export PATH=$PATH:$HOME/.local/bin