Improve code docs for macOS

From microsoft/vscode#19761

docs/setup/mac.md

@@ -17,13 +17,17 @@ MetaDescription: Get Visual Studio Code up and running on Mac.
 3. Drag `Visual Studio Code.app` to the `Applications` folder, making it available in the `Launchpad`.
 4. Add VS Code to your Dock by right-clicking on the icon and choosing `Options`, `Keep in Dock`.
 
->**Tip:** If you want to run VS Code from the terminal by simply typing 'code', VS Code has a command, **Shell Command: Install 'code' command in PATH**, to add 'code' to your `$PATH` variable list.
->
->After installation, launch VS Code. Now open the **Command Palette** (`kb(workbench.action.showCommands)`) and type `shell command` to find the **Shell Command: Install 'code' command in PATH** command.
->
->![Mac shell commands](images/mac/shell-command.png)
->
->After executing the command, restart the terminal for the new `$PATH` value to take effect. You'll be able to simply type 'code .' in any folder to start editing files in that folder.
+### Command Line
+
+You can also run VS Code from the terminal by simply typing `code`.
+
+To set it up, launch VS Code. Then open the **Command Palette** (`kb(workbench.action.showCommands)`) and type `shell command` to find the **Shell Command: Install 'code' command in PATH** command.
+
+![Mac shell commands](images/mac/shell-command.png)
+
+Finally, restart the terminal for the new `$PATH` value to take effect. You'll be able to simply type `code .` in any folder to start editing files in that folder.
+
+> **Note:** If you still have the old `code` alias in your `.bash_profile` (or equivalent) from an early VS Code version, remove it and replace it by executing the **Shell Command: Install 'code' command in PATH** command.
 
 ## Updates