Revert CHANGES.md and CONTRIBUTORS.md

CHANGES.md

@@ -19,7 +19,6 @@ Change Log
 #### Fixes :wrench:
 * Fixed bug causing billboards and labels to appear the wrong size when switching scene modes [#6745](https://github.com/AnalyticalGraphicsInc/cesium/issues/6745)
 * Fixed `PolygonGeometry` when using `VertexFormat.POSITION_ONLY`, `perPositionHeight` and `extrudedHeight` [#6790](expect(https://github.com/AnalyticalGraphicsInc/cesium/pull/6790)
-* Fixed a bug that was preventing 3D Tilesets on the opposite side of the globe from being occluded [#6714](https://github.com/AnalyticalGraphicsInc/cesium/issues/6714)
 * Fixed a bug where 3D Tilesets using the `region` bounding volume don't get transformed when the tileset's `modelMatrix` changes. [#6755](https://github.com/AnalyticalGraphicsInc/cesium/pull/6755)
 * Fixed issues related to updating entity show and geometry color [#6835](https://github.com/AnalyticalGraphicsInc/cesium/pull/6835)
 * Fixed `PolygonGeometry` and `EllipseGeometry` tangent and bitangent attributes when a texture rotation is used [#6788](https://github.com/AnalyticalGraphicsInc/cesium/pull/6788)

CONTRIBUTORS.md

@@ -186,4 +186,3 @@ See [CONTRIBUTING.md](CONTRIBUTING.md) for details on how to contribute to Cesiu
 * [Jonathan Puckey](https://github.com/puckey)
 * [Mark Erikson](https://github.com/markerikson)
 * [Hannah Bollar](https://github.com/hanbollar)
-* [Brandon Barker](https://github.com/ProjectBarks)