Adjust language in release notes for GDI backend

Author: halldorfannar

docs/source/release-history/v10.2.0.md

@@ -172,9 +172,9 @@ Additional improvements include:
 
 ### Restructure
 
-The existing GDI implementation has moved to `mss.windows.gdi`. It is currently
-the only backend and therefore the default. We plan to add a DXGI backend in the
-near future. 
+The existing GDI implementation has been converted to a named backend, `"gdi"`.
+It is currently the only backend for Windows and therefore the default. We plan
+to add a DXGI backend in the near future. 
 
 These changes were made while keeping backwards compatibility with existing API.