Add Python 3.11 to Conda docs (#4213)

xref: #4207 (comment)

Authors:
  - https://github.com/jakirkham

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

URL: #4213

Author: jakirkham

docs/cugraph/source/installation/getting_cugraph.md

@@ -45,7 +45,7 @@ conda install -c rapidsai -c conda-forge -c nvidia cugraph cuda-version=12.0
 
 Alternatively, use `cuda-version=11.8` for packages supporting CUDA 11.
 
-Note: This conda installation only applies to Linux and Python versions 3.9/3.10.
+Note: This conda installation only applies to Linux and Python versions 3.9/3.10/3.11.
 
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