Editorial: Fix typo in SetNumberFormatDigitOptions (#1024)

Author: ben-allen

spec/numberformat.html

@@ -111,7 +111,7 @@ <h1>
         1. Set _intlObj_.[[RoundingMode]] to _roundingMode_.
         1. Set _intlObj_.[[TrailingZeroDisplay]] to _trailingZeroDisplay_.
         1. If _mnsd_ is *undefined* and _mxsd_ is *undefined*, let _hasSd_ be *false*. Otherwise, let _hasSd_ be *true*.
-        1. If _mnfd_ is *undefined* and _mxsd_ is *undefined*, let _hasFd_ be *false*. Otherwise, let _hasFd_ be *true*.
+        1. If _mnfd_ is *undefined* and _mxfd_ is *undefined*, let _hasFd_ be *false*. Otherwise, let _hasFd_ be *true*.
         1. Let _needSd_ be *true*.
         1. Let _needFd_ be *true*.
         1. If _roundingPriority_ is *"auto"*, then