Update part2e.md, corrected spelling mistake

Added one whitespace between step and number in exercise section
2.20*: Data for countries, step3 >> 2.20*: Data for countries, step 3

Author: HosenbundIO

src/content/2/en/part2e.md

@@ -595,7 +595,7 @@ Improve on the application in the previous exercise, such that when the names of
 
 In this exercise, it is also enough that your application works for most countries. Countries whose name appears in the name of another country, like <i>Sudan</i>, can be ignored.
 
-<h4>2.20*: Data for countries, step3</h4>
+<h4>2.20*: Data for countries, step 3</h4>
 
 Add to the view showing the data of a single country, the weather report for the capital of that country. There are dozens of providers for weather data. One suggested API is [https://openweathermap.org](https://openweathermap.org). Note that it might take some minutes until a generated API key is valid.