Improve ch03-05-control-flow collection looping wording

This makes it clearer, that you COULD use a `while` loop to loop a collection, but a `for` loop is the preferred way

Author: RafaelKr

src/ch03-05-control-flow.md

@@ -297,7 +297,7 @@ evaluates to `true`, the code runs; otherwise, it exits the loop.
 
 #### Looping Through a Collection with `for`
 
-You can choose to use the `while` construct to loop over the elements of a
+You could choose to use the `while` construct to loop over the elements of a
 collection, such as an array. For example, the loop in Listing 3-4 prints each
 element in the array `a`.