Remove unnecessary adjective

Author: carols10cents

src/ch19-02-refutability.md

@@ -51,8 +51,8 @@ pattern `Some(x)`, Rust rightfully produces a compiler error.
 If we have a refutable pattern where an irrefutable pattern is needed, we can
 fix it by changing the code that uses the pattern: Instead of using `let`, we
 can use `let else`. Then, if the pattern doesn’t match, the code in the curly
-brackets will handle the nonmatching value. Listing 19-9 shows how to fix the
-code in Listing 19-8.
+brackets will handle the value. Listing 19-9 shows how to fix the code in
+Listing 19-8.
 
 <Listing number="19-9" caption="Using `let...else` and a block with refutable patterns instead of `let`">