bootstrap: add explanation of command blocks

Author: calcmogul

bootstrap/index.html

@@ -145,6 +145,8 @@ <h3 id="Formatter">Formatter</h3>
       write code in that style directly.
     </blockquote>
     <h2 id="Tools_installation_on_Ubuntu">Tools installation on Ubuntu</h2>
+    <p>The command blocks below should be run in a bash shell, where each line
+    is entered separately and followed by the Enter key.</p>
     <h3>Visual Studio Code</h3>Follow the installation guide from <a href=
     "https://docs.wpilib.org/en/latest/docs/zero-to-robot/step-2/wpilib-setup.html">
     WPILib Docs</a>.