Update DGL_support.md (#4327)

Believe the path suggested previously is outdated.

Authors:
  - Ray Bell (https://github.com/raybellwaves)
  - Don Acosta (https://github.com/acostadon)
  - Rick Ratzel (https://github.com/rlratzel)

Approvers:
  - Don Acosta (https://github.com/acostadon)

URL: #4327

docs/cugraph/source/graph_support/DGL_support.md

@@ -17,7 +17,7 @@ mamba install cugraph-dgl -c rapidsai-nightly -c rapidsai -c pytorch -c conda-fo
 
 ### Create the conda development environment
 ```
-mamba env create -n cugraph_dgl_dev --file conda/cugraph_dgl_dev_11.6.yml
+conda env create -n cugraph_dgl_dev --file conda/environments/all_cuda-122_arch-x86_64.yaml
 ```
 
 ### Install  in editable mode