Missing information in App Native Authentication documentation

[janakamarasena]

Is your suggestion related to a missing or misleading document? Please describe.
The official App Native Authentication documentation [1] has gaps on how federated authentication works and the information related to available authentication options.

[1] - https://is.docs.wso2.com/en/latest/guides/authentication/add-app-native-authentication/

Describe the improvement
Include information on authentication options including any special considerations (ex: working mode of federation options).

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