Update literal_representation.rs

Author: iankronquist

clippy_lints/src/literal_representation.rs

@@ -35,7 +35,7 @@ declare_clippy_lint! {
     /// **Known problems:**
     /// - Recommends a signed suffix, even though the number might be too big and an unsigned
     ///   suffix is required
-    /// - Does not match on `_128` since that is a valid grouping for decimal numbers
+    /// - Does not match on `_127` since that is a valid grouping for decimal and octal numbers
     ///
     /// **Example:**
     ///