[docs] update docs
diff --git a/erpnext/docs/assets/img/human-resources/training_event.png b/erpnext/docs/assets/img/human-resources/training_event.png
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--- a/erpnext/docs/assets/img/human-resources/training_event.png
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diff --git a/erpnext/docs/assets/img/human-resources/training_selfstudy.png b/erpnext/docs/assets/img/human-resources/training_selfstudy.png
deleted file mode 100644
index 49066c5..0000000
--- a/erpnext/docs/assets/img/human-resources/training_selfstudy.png
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