Update docs and changes a bit

Author: lilleyse

CHANGES.md

@@ -11,6 +11,7 @@ Change Log
 * Added `cartographicLimitRectangle` to `Globe`. Use this to limit terrain and imagery to a specific `Rectangle` area. [#6987](https://github.com/AnalyticalGraphicsInc/cesium/pull/6987)
 * Added `OpenCageGeocoderService`, which provides geocoding via [OpenCage](https://opencagedata.com/). [#7015](https://github.com/AnalyticalGraphicsInc/cesium/pull/7015)
 * Added ground atmosphere lighting in 3D. This can be toggled with `Globe.showGroundAtmosphere`. [6877](https://github.com/AnalyticalGraphicsInc/cesium/pull/6877)
+    * Added `Globe.nightFadeOutDistance` and `Globe.nightFadeInDistance` to configure when ground atmosphere night lighting fades in and out. [6877](https://github.com/AnalyticalGraphicsInc/cesium/pull/6877)
 
 ##### Fixes :wrench:
 * Fixed picking for overlapping translucent primitives. [#7039](https://github.com/AnalyticalGraphicsInc/cesium/pull/7039)

Source/Scene/Globe.js

@@ -163,7 +163,7 @@ define([
 
         /**
          * The distance where the darkness of night from the ground atmosphere fades out to a lit ground atmosphere.
-         * This only takes effect when <code>showGroundAtmosphere</code> is <code>true</code>.
+         * This only takes effect when <code>showGroundAtmosphere</code> and <code>enableLighting</code> are <code>true</code>.
          *
          * @type {Number}
          * @default 10000000.0
@@ -172,7 +172,7 @@ define([
 
         /**
          * The distance where the darkness of night from the ground atmosphere fades in to an unlit ground atmosphere.
-         * This only takes effect when <code>showGroundAtmosphere</code> is <code>true</code>.
+         * This only takes effect when <code>showGroundAtmosphere</code> and <code>enableLighting</code> are <code>true</code>.
          *
          * @type {Number}
          * @default 50000000.0