fix(strings2): update line number in hint

Author: ageorgou

info.toml

@@ -214,7 +214,7 @@ mode = "compile"
 hint = """
 Yes, it would be really easy to fix this by just changing the value bound to `word` to be a
 string slice instead of a `String`, wouldn't it?? There is a way to add one character to line
-6, though, that will coerce the `String` into a string slice."""
+9, though, that will coerce the `String` into a string slice."""
 
 # TEST 2