Fix typos on Maintainability slide

lectures/complexity/slides.qmd

@@ -175,9 +175,9 @@ Complexity is not about complicated designs
 
 **If code works, why put more effort in it to reduce complexity and make it more approachable?**
 
- - Your future self and others can understand faster,
+ - Your future self and others can understand the code faster,
  - Changing and adding components should be easy and only require local adjustments,
- - Bugs are easier to find when the complecity is low (and components individually testable),
+ - Bugs are easier to find when the complexity is low (and components individually testable),
  - This also makes testing easier and more likely to test all code paths (high code coverage)