[docs] some examples does not print the output

[pawelru]

There are a few articles that does not print the outputs. It's because their example code is just res <- foo(...) without printing the res (or avoiding assignment completely). Please grep the example code against this pattern. Few examples:
https://insightsengineering.github.io/chevron/main/reference/ael02.html#ref-examples
https://insightsengineering.github.io/chevron/main/reference/ael03.html#ref-examples