Fix comment about Mambaforge install #2304

Job	Run time
Check PR Event	1s
Validate Features	10s
Build / Check GH Event	1s
Build / RAPIDS / build (amd64, 12.0, conda)	3h 29m 30s
Build / RAPIDS / build (amd64, 12.0, pip)	2h 52m 9s
Build / RAPIDS / build (amd64, 12.5, conda)	3h 48m 34s
Build / RAPIDS / build (amd64, 12.5, pip)	2h 49m 5s
Determine features matrix	7s
Determine image matrix	7s
Test ${{ matrix.feature }} scenarios	0s
Feature integration / amd64	33m 15s
Feature integration / arm64	28m 45s
Test mambaforge feature / amd64	1m 38s
Test mambaforge feature / arm64	1m 47s
${{ matrix.name \|\| 'Windows' }}	0s
mambaforge-ubuntu:22.04 / amd64	2m 59s
mambaforge-ubuntu:22.04 / arm64	2m 52s
cuda11.8-mambaforge-ubuntu:22.04 / amd64	7m 27s
cuda11.8-mambaforge-ubuntu:22.04 / arm64	8m 35s
mambaforge-ubuntu:22.04 / Push to Docker Hub	0s
cuda11.8-mambaforge-ubuntu:22.04 / Push to Docker Hub	0s
	14h 27m 2s

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