Merge pull request #277 from AaltoSciComp/rkdarst/scirpts-output

content/scripts: Fix example, `output` isn't a optional argument

Author: bast

content/scripts.rst

@@ -252,7 +252,7 @@ Exercises 2
       $ python weather_observations.py https://raw.githubusercontent.com/AaltoSciComp/python-for-scicomp/master/resources/data/scripts/weather_tapiola.csv temperature_tapiola.png
       $ python weather_observations.py -s 1/12/2020 -e 31/12/2020 https://raw.githubusercontent.com/AaltoSciComp/python-for-scicomp/master/resources/data/scripts/weather_tapiola.csv temperature_tapiola_dec.png
       $ python weather_observations.py -s 1/2/2021 -e 28/2/2021 https://raw.githubusercontent.com/AaltoSciComp/python-for-scicomp/master/resources/data/scripts/weather_tapiola.csv temperature_tapiola_feb.png
-      $ python weather_observations.py https://raw.githubusercontent.com/AaltoSciComp/python-for-scicomp/master/resources/data/scripts/weather_cairo.csv --output temperature_cairo.png
+      $ python weather_observations.py https://raw.githubusercontent.com/AaltoSciComp/python-for-scicomp/master/resources/data/scripts/weather_cairo.csv temperature_cairo.png
 
    - We can now process different input files without changing the script.
    - We can select multiple time ranges without modifying the script.