Merge pull request #3447 from xtermjs/Tyriar-patch-1

Make addons tab title consistent

Author: Tyriar

demo/index.html

@@ -22,7 +22,7 @@ <h1 style="color: #2D2E2C">xterm.js: A terminal for the <em style="color: #5DA5D
       <div id="grid">
         <div class="tab">
           <button id= "optionsbutton" class="tabLinks" onclick="openSection(event, 'options')">Options</button>
-          <button id= "addonsbutton" class="tabLinks" onclick="openSection(event, 'addons')">Add Ons</button>
+          <button id= "addonsbutton" class="tabLinks" onclick="openSection(event, 'addons')">Addons</button>
           <button id= "stylebutton" class="tabLinks" onclick="openSection(event, 'style')">Style</button>
           <button id= "testbutton" class="tabLinks" onclick="openSection(event, 'test')">Test</button>
         </div>