fix 'comms' import in the api_docs (#2327)

This PR fixes the `comms` import in the API docs.

Authors:

Approvers:
   - AJ Schmidt (https://github.com/ajschmidt8)
   - Brad Rees (https://github.com/BradReesWork)

Author: jnke2016

docs/cugraph/source/api_docs/dask-cugraph.rst

@@ -20,7 +20,7 @@ Example
 
     from dask.distributed import Client, wait
     from dask_cuda import LocalCUDACluster
-    import cugraph.dask.comms as Comms
+    import cugraph.dask.comms.comms as Comms
     import cugraph.dask as dask_cugraph
 
     cluster = LocalCUDACluster()