refactor: remove referent to improve readability

Author: hamirmahal

info.toml

@@ -378,7 +378,7 @@ path = "exercises/06_move_semantics/move_semantics5.rs"
 mode = "test"
 hint = """
 Carefully reason about the range in which each mutable reference is in
-scope. Does it help to update the value of referent (`x`) immediately after
+scope. Does it help to update the value of `x` immediately after
 the mutable reference is taken? Read more about 'Mutable References'
 in the book's section 'References and Borrowing':
 https://doc.rust-lang.org/book/ch04-02-references-and-borrowing.html#mutable-references.