Update lesson.md

Author: YuTian8328

content/lesson.md

@@ -5,7 +5,7 @@
 
 The file [weather_data.csv](https://github.com/coderefinery/modular-type-along/blob/main/data/weather_data.csv)
 ([raw csv file](https://raw.githubusercontent.com/coderefinery/modular-type-along/main/data/weather_data.csv))
-contains hourly air temperature measurements for the observation station
+contains hourly weather measurements from the observation station
 "Vantaa Helsinki-Vantaan lentoasema" (Helsinki airport) during 2024.
 
 :::{admonition} Origin of the data