Bug 1708422: part 15) Update documentation of `Selection::GetRangesForInterval`. r=smaug

Differential Revision: https://phabricator.services.mozilla.com/D114334

dom/base/Selection.h

@@ -428,6 +428,8 @@ class Selection final : public nsSupportsWeakReference,
   SelectionType Type() const { return mSelectionType; }
 
   /**
+   * See documentation of `GetRangesForInterval` in Selection.webidl.
+   *
    * @param aReturn references, not copies, of the internal ranges.
    */
   void GetRangesForInterval(nsINode& aBeginNode, int32_t aBeginOffset,