[docs] stop allowing permalinks on list items
[docs] stop allowing permalinks on list items

Permalinking to individual list items is rarely useful, difficult to properly generate anchor tag slugs for, and makes things like ToCs on each page more difficult and less nice (if the ToC item has the same text as the header it should link to, then the actual header's anchor tag will have a '-1' at the end). GitHub does not permalink to individual list items when it renders markdown. In the absence of a clear reason not to, we should just remove these links.

Test plan: ran the docs locally, ensured that both ordered and unordered lists rendered properly.

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