fix: Change then to than
`than` makes more grammatical sense than `then` in this context.
@@ -64,7 +64,7 @@ hint = """
We know about variables and mutability, but there is another important type of
variable available; constants.
Constants are always immutable and they are declared with keyword 'const' rather
-then keyword 'let'.
+than keyword 'let'.
Constants types must also always be annotated.
Read more about constants under 'Differences Between Variables and Constants' in the book's section 'Variables and Mutability':
