Update the Kepler beginner notebook description #12

Job	Run time
notebook-ci-and-deploy / setup-matrix	38s
notebook-ci-and-deploy / store-non-notebook-files	32s
notebook-ci-and-deploy / process-notebooks	0s
notebook-ci-and-deploy / manage-deprecation	0s
notebook-ci-and-deploy / validate-jupyter-book	0s
notebook-ci-and-deploy / build-documentation	4m 0s
notebook-ci-and-deploy / workflow-summary	39s
	5m 49s

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