Add note about improvements only happening on v2 now (#8114)

docs/source/transforms.rst

@@ -103,7 +103,9 @@ V1 or V2? Which one should I use?
 
 **TL;DR** We recommending using the ``torchvision.transforms.v2`` transforms
 instead of those in ``torchvision.transforms``. They're faster and they can do
-more things. Just change the import and you should be good to go.
+more things. Just change the import and you should be good to go. Moving
+forward, new features and improvements will only be considered for the v2
+transforms.
 
 In Torchvision 0.15 (March 2023), we released a new set of transforms available
 in the ``torchvision.transforms.v2`` namespace. These transforms have a lot of