JARM configurations need to be updated

[Akila94]

Location : https://ob.docs.wso2.com/en/latest/learn/jarm-for-oauth2/

The existing configurations in the documentation won't apply them to the identity.xml file. Need to update the configs with correct formats.

[Akila94]

The configs in the default.json is as follows,

"oauth.jarm.enable": false,
  "oauth.jarm.jwt.enable": false,
  "oauth.jarm.query_jwt.enable": false,
  "oauth.jarm.fragment_jwt.enable": false,
  "oauth.jarm.form_post_jwt.enable": false,
  "oauth.jarm.jarm_response_jwt_validity": "600",
  "oauth.jarm.response_mode.jwt.class": "org.wso2.carbon.identity.oauth2.responsemode.provider.jarm.impl.JwtResponseModeProvider",
  "oauth.jarm.response_mode.query_jwt.class": "org.wso2.carbon.identity.oauth2.responsemode.provider.jarm.impl.QueryJwtResponseModeProvider",
  "oauth.jarm.response_mode.fragment_jwt.class": "org.wso2.carbon.identity.oauth2.responsemode.provider.jarm.impl.FragmentJwtResponseModeProvider",
  "oauth.jarm.response_mode.form_post_jwt.class": "org.wso2.carbon.identity.oauth2.responsemode.provider.jarm.impl.FormPostJwtResponseModeProvider",