Update install guide doc

userguide/docs/admin.md

userguide/docs/clients.md

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userguide/docs/img/client/android/android-step1.jpg

userguide/docs/img/client/android/android-step1.png

userguide/docs/img/client/android/android-step2.jpg

userguide/docs/img/client/android/android-step2.png

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userguide/docs/img/ldap.png

userguide/docs/img/local.png

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userguide/docs/index.md