Fix Obtainium link in sidebar

Author: sethforprivacy

mkdocs.yml

@@ -129,7 +129,7 @@ nav:
       - get-started/android/index.md
       - get-started/android/google-play.md
       - get-started/android/accrescent.md
-      - get-started/android/obtanium.md
+      - get-started/android/obtainium.md
       - get-started/android/fdroid.md
     - Linux:
       - get-started/linux/index.md