One name for different items

Created by: soratnikov

Problem statement

One name for different items in user guide (see attachment screenshot)

Steps to reproduce

Open link https://nortikin.github.io/sverchok/docs/nodes/list_masks/mask_to_index.html
Open link https://nortikin.github.io/sverchok/docs/nodes/list_masks/index_to_mask.html
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