[AutoMM] Fix pdf classficiation tutorial #7456

Job	Run time	Billable time
branch_check	3s	0s
lint_check	3s	0s
package_diff	5m 7s	0s
test_common	4s	0s
test_core	6s	0s
test_features	4s	0s
test_multimodal_predictor	3s	0s
test_tabular	4s	0s
test_tabular_lite	4s	0s
test_multimodal_others	4s	0s
test_timeseries	3s	0s
test_install	3s	0s
test_multimodal_others_2	6s	0s
build_timeseries_tutorial	20m 31s	0s
build_tabular_prediction_tutorial	1h 24m 3s	0s
build_cloud_fit_deploy_tutorial	10m 38s	0s
build_multimodal_tutorial (advanced_topics)	57m 18s	0s
build_multimodal_tutorial (image_prediction)	21m 0s	0s
build_multimodal_tutorial (semantic_matching)	37m 20s	0s
build_multimodal_tutorial (object_detection)	31m 29s	0s
build_multimodal_tutorial (text_prediction)	41m 6s	0s
build_multimodal_tutorial (document_prediction)	20m 14s	0s
build_multimodal_tutorial (multimodal_prediction)	36m 33s	0s
build_multimodal_tutorial (image_segmentation)	22m 26s	0s
build_all_docs	6m 45s	0s
copy-docs	46s	0s
	6h 36m 3s	0s

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