fix typo

Extensions/combined/readme.md

@@ -6,7 +6,7 @@
 
 <ol>
     <li>Go to the root directory of the project</li>
-    <li>Run <code>npm i</code> to install all project dependancies (if not done so already)</li>
+    <li>Run <code>npm i</code> to install all project dependencies (if not done so already)</li>
     <li>run <code>npm run dev</code> to compile the extension to the <code>~/Extensions/combined/dist/</code> folder.</li>
 </ol>