docs(changelog): add the globe-in-view fragment

changelog.d/1532-globe-in-view.md

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+- Keep the globe in view from orbit. Cesium's free look (Shift+drag) turned
+  the camera in place, so a few drags from the whole-globe view left only
+  stars, and the pose stayed in the share link. Free look now works only below
+  1,000 km; a camera move that ends above it with no planet surface in view
+  (inside the scope keyhole when the scope is on) turns straight down; and
+  voice tilt and turns from orbit stop while the planet is still on screen and
+  say so instead of reporting a turn they could not make (Manjunath,
+  @manjunath22466, #1532).