docs(download): refine Ubuntu PPA instructions

Author: trollixx

download.html

@@ -118,11 +118,11 @@ <h3 id="linux-slackware">Slackware</h3>
 
   <h3 id="linux-ubuntu">Ubuntu</h3>
   <p>Install Zeal from the official repositories:</p>
-  <pre>$ sudo apt install zeal</pre>
+  <pre>sudo apt install zeal</pre>
   <p>When the official package is outdated, our PPA provides up-to-date stable releases:</p>
-  <pre>$ sudo add-apt-repository ppa:zealdocs/ppa<br>$ sudo apt update<br>$ sudo apt install zeal</pre>
+  <pre>sudo add-apt-repository ppa:zealdocs<br>sudo apt install zeal</pre>
   <p>To try the latest features before they are released, use the nightly PPA instead:</p>
-  <pre>$ sudo add-apt-repository ppa:zealdocs/nightly<br>$ sudo apt update<br>$ sudo apt install zeal</pre>
+  <pre>sudo add-apt-repository ppa:zealdocs/nightly<br>sudo apt install zeal</pre>
   <p>
     <a href="https://packages.ubuntu.com/search?keywords=zeal&searchon=names" class="btn btn-default" role="button">View Ubuntu packages</a>
     <a href="https://launchpad.net/~zealdocs/+archive/ubuntu/ppa" class="btn btn-default" role="button">View stable PPA</a>