doc: update timingSafeEqual error case

AlexA-1976 · danielleadams · commit 55714cc777e0 · 2022-03-14T09:31:11.000-04:00
PR-URL: #41507 Reviewed-By: Tobias Nießen <tniessen@tnie.de> Reviewed-By: Colin Ihrig <cjihrig@gmail.com> Reviewed-By: James M Snell <jasnell@gmail.com> Reviewed-By: Filip Skokan <panva.ip@gmail.com>
diff --git a/doc/api/crypto.md b/doc/api/crypto.md
@@ -5257,7 +5257,8 @@ comparing HMAC digests or secret values like authentication cookies or
 [capability urls](https://www.w3.org/TR/capability-urls/).
 
 `a` and `b` must both be `Buffer`s, `TypedArray`s, or `DataView`s, and they
-must have the same byte length.
+must have the same byte length. An error is thrown if `a` and `b` have
+different byte lengths.
 
 If at least one of `a` and `b` is a `TypedArray` with more than one byte per
 entry, such as `Uint16Array`, the result will be computed using the platform
