docs(changelog): add the #1703 fragment

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

changelog.d/1703-shipwrecks-no-clamp.md

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+- Fix the page freezing for three to five seconds when Shipwrecks is switched
+  on over a loaded globe. Each of the 7,958 markers read the terrain height as
+  it was created; they are now placed on the ellipsoid, where they already
+  drew (mazy1998, #1703).