C#: Update change note for location handling in query

Author: redsun82

csharp/ql/src/change-notes/2025-10-17-location-in-web-config.md

@@ -1,4 +1,4 @@
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 category: minorAnalysis
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-* the `cs/web/missing-x-frame-options` query now correctly handles configuration nested in a `<location >` elements.
+* the `cs/web/missing-x-frame-options` query now correctly handles configuration nested in root `<location>` elements.