egplat

Improve embedded package documentation

2

We should update code comments. See https://github.com/FerretDB/FerretDB/issues/2326#issuecomment-1496910188. --- ### Versions 0.9.3 ### What did you do? ``` f, err := ferretdb.New(&ferretdb.Config{ Listener: ferretdb.ListenerConfig{ TCP: "127.0.0.1:17027", }, Handler: "pg", PostgreSQLURL: "postgres://127.0.0.1:5432/ferretdb",...