Fix typo

Author: dkhamsing

contents.json

@@ -23674,7 +23674,7 @@
       "source": "https://github.com/fulldecent/vowel-practice",
       "license": "mit",
       "tags": [
-        "swift", "macos"
+        "swift", "macos",
         "ipad"
       ],
       "stars": 63,