Clarify (#17733)

wiki/src/about.html

@@ -144,7 +144,7 @@
   <p class="medium">Tails includes:</p>
 
   <ul class="medium">
-    <li><i>Tor Browser</i> with <i>uBlock</i>, a secure browser with an ad-blocker</li>
+    <li><i>Tor Browser</i> with <i>uBlock</i>, a secure browser and an ad-blocker</li>
     <li><i>Thunderbird</i> with <i>Enigmail</i>, for encrypted emails</li>
     <li><i>KeePassXC</i>, to create and store strong passwords</li>
     <li><i>LibreOffice</i>, an office suite</li>