KTOR-8405 Add typed configuration in the "What's new" doc

[vnikolova]

KTOR-8405

Add documentation for configuration file deserialization in the What's new in Ktor 3.2.0 topic

To do:

• Add a link to the new configuration page (New Configuration Pages #630)

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[nomisRev]

Looks good to me! Should we add a small example yaml as well?

database:
   url: "$DATABASE_URL:jdbc:postgresql://localhost:5432/postgres"
   username: "$DATABASE_USER:ktor_admin"
   password: "$DATABASE_PASSWORD:ktor123!"