Fixed some typos #537

Job	Run time
Build-environments (jupyter-book/introduction/analysis_tools.yml)	2m 47s
Build-environments (jupyter-book/preprocessing_visualization/preprocessing.yml)	1m 2s
Build-environments (jupyter-book/cellular_structure/clustering.yml)	40s
Build-environments (jupyter-book/cellular_structure/annotation.yml)	2m 29s
Build-environments (jupyter-book/cellular_structure/integration.yml)	1m 23s
Build-environments (jupyter-book/conditions/compositional.yml)	2m 29s
Build-environments (jupyter-book/conditions/gsea_pathway.yml)	59s
Build-environments (jupyter-book/conditions/perturbation_modeling.yml)	2m 31s
Build-environments (jupyter-book/conditions/differential_gene_expression.yml)	2m 37s
Build-environments (jupyter-book/trajectories/lineage_tracing.yml)	1m 34s
Build-environments (jupyter-book/trajectories/pseudotemporal.yml)	34s
Build-environments (jupyter-book/mechanisms/cell_cell_communication.yml)	1m 9s
Build-environments (jupyter-book/spatial/spatial.yml)	14m 12s
Build-environments (jupyter-book/surface_protein/surface_protein.yml)	33s
Build-environments (jupyter-book/multimodal_integration/paired_integration.yml)	2m 45s
Build-environments (jupyter-book/multimodal_integration/advanced_integration.yml)	2m 58s
	40m 42s

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