Fixes typo in docs (kivy#1740)

Co-authored-by: AJRepo <[email protected]>

buildozer/tools/packer/http/welcome/index.html

@@ -75,7 +75,7 @@ <h2 id="sharefolder">Share a folder</h2>
     Virtualbox doesn't support symlink in Shared Folder anymore. So buildozer
     will fail during the build.<br/>
     We already created a <code>/build</code> directory where you can put your
-    build in it. Edit your <code>buildozer.ini</code>:
+    build in it. Edit your <code>buildozer.spec</code>:
     <pre>[buildozer]
 build_dir = /build/buildozer-myapp</pre>
 </div>