docs(changelog): add the #1706 fragment

Co-Authored-By: Claude Fable 5.2 <[email protected]>

changelog.d/1706-alpr-anchor-sampling.md

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+- ALPR camera badges no longer take depth samples while the overlay paints, or
+  again each time the layer is switched back on. On a terrain globe their
+  height comes from the loaded terrain and is remembered per camera; some
+  badges move a few metres onto the drawn surface (mazy1998, #1706).