Editorial: Removed several unnecessary double negatives

[ben-allen]

Rebased 3-1-24, and updated to include @gibson042 suggestion to improve readability of SetNumberFormatDigitOptions AO in Intl.NumberFormat
Fix #458

Refactored several cases from

1. If not undefined, then
   a. X
   2 Else,
   a. Y

with

1. If undefined, then
   a. Y
2. Else,
   a. X

and

1. If not undefined, then
   a. Return X.
2. Return Y.

to

1. If undefined, then
   a. Return Y.
2. Return X.

[gibson042]

This still strikes me as hard to read. Maybe consolidating the alternatives would help?

Suggested change

	1. If _mnsd_ is not *undefined* or _mxsd_ is not *undefined*, then
	1. Let _hasSd_ be *true*.
	1. Else,
	1. If _mnsd_ is *undefined* and _mxsd_ is *undefined*, then
	1. Let _hasSd_ be *false*.
	1. If _mnfd_ is not *undefined* or _mxfd_ is not *undefined*, then
	1. Let _hasFd_ be *true*.
	1. Else,
	1. Let _hasSd_ be *true*.
	1. If _mnfd_ is *undefined* and _mxfd_ is *undefined*, then
	1. Let _hasFd_ be *false*.
	1. Else,
	1. Let _hasFd be *true*.
	1. If _mnsd_ is *undefined* and _mxsd_ is *undefined*, let _hasSd_ be *false*. Otherwise, let _hasSd_ be *true*.
	1. If _mnfd_ is *undefined* and _mxfd_ is *undefined*, let _hasFd_ be *false*. Otherwise, let _hasFd be *true*.

[sffc]

Fairly neutral on this; smaller changes are better.