Update setup.html (#24266)

Make the language a bit clearer.

manual/en/setup.html

@@ -34,7 +34,7 @@
 The first article was <a href="fundamentals.html">about three.js fundamentals</a>.
 If you haven't read that yet you might want to start there.</p>
 <p>Before we go any further we need to talk about setting up your
-computer to do development. In particular, for security reasons,
+computer as a development environment. In particular, for security reasons,
 WebGL cannot use images from your hard drive directly. That means
 in order to do development you need to use a web server. Fortunately
 development web servers are super easy to setup and use.</p>
@@ -51,7 +51,7 @@ Once downloaded double click the zip file to unpack the files.</p>
 <p>Just point it at the folder where you unzipped the files, click "Start", then go to
 in your browser <a href="http://localhost:8080/"><code class="notranslate" translate="no">http://localhost:8080/</code></a> or if you'd
 like to browse the samples go to <a href="http://localhost:8080/threejs"><code class="notranslate" translate="no">http://localhost:8080/threejs</code></a>.</p>
-<p>To stop serving pick stop or quit Servez.</p>
+<p>To stop serving click stop or quit Servez.</p>
 <p>If you prefer the command line (I do), another way is to use <a href="https://nodejs.org">node.js</a>.
 Download it, install it, then open a command prompt / console / terminal window. If you're on Windows the installer will add a special "Node Command Prompt" so use that.</p>
 <p>Then install the <a href="https://github.com/greggman/servez-cli"><code class="notranslate" translate="no">servez</code></a> by typing</p>
@@ -85,4 +85,4 @@ servez
 
 
 
-</body></html>
+</body></html>