Fixed typo in introduction. (#276) #481

Job	Run time
Build-environments (jupyter-book/introduction/analysis_tools.yml)	56s
Build-environments (jupyter-book/preprocessing_visualization/preprocessing.yml)	1m 41s
Build-environments (jupyter-book/cellular_structure/clustering.yml)	58s
Build-environments (jupyter-book/cellular_structure/annotation.yml)	2m 47s
Build-environments (jupyter-book/cellular_structure/integration.yml)	2m 31s
Build-environments (jupyter-book/conditions/compositional.yml)	3m 22s
Build-environments (jupyter-book/conditions/gsea_pathway.yml)	1m 28s
Build-environments (jupyter-book/conditions/perturbation_modeling.yml)	4m 35s
Build-environments (jupyter-book/conditions/differential_gene_expression.yml)	4m 17s
Build-environments (jupyter-book/trajectories/lineage_tracing.yml)	2m 5s
Build-environments (jupyter-book/trajectories/pseudotemporal.yml)	57s
Build-environments (jupyter-book/mechanisms/cell_cell_communication.yml)	1m 40s
Build-environments (jupyter-book/spatial/spatial.yml)	9m 4s
Build-environments (jupyter-book/surface_protein/surface_protein.yml)	55s
Build-environments (jupyter-book/multimodal_integration/paired_integration.yml)	3m 13s
Build-environments (jupyter-book/multimodal_integration/advanced_integration.yml)	3m 40s
	44m 9s

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