Fix description of en/guides/
Fix description of en/guides/android/migration-guide/managing-users/
Fix description of en/guides/android/managing-ads/displaying-ads-in-your-application/
Fix description and snippet of en/guides/rest/admin-features/changing-user-password/
Fix description of en/guides/rest/admin-features/configuring-push-notification/
Fix description of en/starts/android/adding-kii-sync-sdk-to-your-application/
Merge pull request #120 from ochtea/01_en_guide_fix

Reflecting fixes by Ochi-san.