docs: clarify max limit (none)

Co-authored-by: Israel Blancas <[email protected]>

receiver/kafkareceiver/config.go

@@ -83,7 +83,7 @@ type Config struct {
 	MinFetchSize int32 `mapstructure:"min_fetch_size"`
 	// The default bytes per fetch from Kafka (default "1048576")
 	DefaultFetchSize int32 `mapstructure:"default_fetch_size"`
-	// The maximum bytes per fetch from Kafka (default "0")
+	// The maximum bytes per fetch from Kafka (default "0", no limit)
 	MaxFetchSize int32 `mapstructure:"max_fetch_size"`
 }