text: Title: docs: replace f-string in logger usage
  Body: Some our documentation examples uses f-strings – eg https://faststream.airt.ai/latest/getting-started/serialization/examples/#__codelineno-11-23
  
  We should replacte them to follow official logging usage recomendations `logger.log("%s", "message")`
  
  It doesn't related to framework sources! Just documentation examples only