Fixed typos in Onboarding (#1215)

Author: mgurgel

special-pages/pages/onboarding/src/locales/en/onboarding.json

@@ -322,7 +322,7 @@
     "note": "Title for importing user data (bookmarks, passwords) to DuckDuckGo from other browsers."
   },
   "row_import_summary_v3": {
-    "title": "On device encryption keeps your passwords secure.",
+    "title": "On-device encryption keeps your passwords secure.",
     "note": "Explanation of additional security benefits of importing user's passwords into DuckDuckGo."
   },
   "row_import_accept_v3": {
@@ -354,7 +354,7 @@
     "note": "The description of a browser privacy feature in the comparison table."
   },
   "comparison_blockCookies": {
-    "title": "Block cookie requests & popups",
+    "title": "Block cookie requests & pop-ups",
     "note": "The description of a browser privacy feature in the comparison table."
   },
   "comparison_blockAds": {