Merge branch '1.0.x' of github.com:dmlc/dgl into 1.0.x

Author: BarclayII

docs/source/install/index.rst

@@ -174,7 +174,7 @@ PyTorch backend
 ```````````````
 
 Export ``DGLBACKEND`` as ``pytorch`` to specify PyTorch backend. The required PyTorch
-version is 1.9.0 or later. See `pytorch.org <https://pytorch.org>`_ for installation instructions.
+version is 1.12.0 or later. See `pytorch.org <https://pytorch.org>`_ for installation instructions.
 
 MXNet backend
 `````````````