javascript: Add change note for document.defaultView aliasing window

Introduced a new change note detailing that `DataFlow::globalVarRef` now recognizes `document.defaultView` as an alias of `window`, enhancing the modeling of data flows involving `history` in queries.

Author: Eliav2

javascript/ql/lib/change-notes/released/2.6.15.md renamed to javascript/ql/lib/change-notes/2025-11-19-default-view.md

@@ -1,5 +1,5 @@
-## 2.6.15
-
-### Minor Analysis Improvements
+---
+category: minorAnalysis
+---
 
 - JavaScript `DataFlow::globalVarRef` now recognizes `document.defaultView` as an alias of `window`, allowing flows such as `document.defaultView.history.pushState(...)` to be modeled and found by queries relying on `globalVarRef("history")`.