Improved iterators5.rs explanation.

info.toml

@@ -694,7 +694,7 @@ Step 2 & step 2.1:
 Very similar to the lines above and below. You've got this!
 Step 3:
 An iterator goes through all elements in a collection, but what if we've run out of
-elements? What should we expect here? If you're stuck, take a look at 
+elements? What should we expect here? If you're stuck, take a look at
 https://doc.rust-lang.org/std/iter/trait.Iterator.html for some ideas.
 """
 
@@ -749,12 +749,13 @@ hint = """
 The documentation for the std::iter::Iterator trait contains numerous methods
 that would be helpful here.
 
-Return 0 from count_stack to make the code compile in order to test count.
+Return 0 from count_collection_iterator to make the code compile in order to
+test count_iterator.
 
-The stack variable in count_stack is a slice of HashMaps. It needs to be
-converted into an iterator in order to use the iterator methods.
+The collection variable in count_collection_iterator is a slice of HashMaps. It
+needs to be converted into an iterator in order to use the iterator methods.
 
-The fold method can be useful in the count_stack function."""
+The fold method can be useful in the count_collection_iterator function."""
 
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