chore: update errors1 comments and hint

exercises/error_handling/errors1.rs

@@ -1,9 +1,8 @@
 // errors1.rs
 // This function refuses to generate text to be printed on a nametag if
 // you pass it an empty string. It'd be nicer if it explained what the problem
-// was, instead of just sometimes returning `None`. The 2nd test currently
-// does not compile or pass, but it illustrates the behavior we would like
-// this function to have.
+// was, instead of just sometimes returning `None`. Thankfully, Rust has a similar
+// construct to `Option` that can be used to express error conditions. Let's use it!
 // Execute `rustlings hint errors1` for hints!
 
 // I AM NOT DONE
@@ -21,9 +20,6 @@ pub fn generate_nametag_text(name: String) -> Option<String> {
 mod tests {
     use super::*;
 
-    // This test passes initially if you comment out the 2nd test.
-    // You'll need to update what this test expects when you change
-    // the function under test!
     #[test]
     fn generates_nametag_text_for_a_nonempty_name() {
         assert_eq!(