Multiple problems on the Symbols documntation page

[MDLC01]

Description

There are multiple issues with the Symbols documentation (not to be confused with General Symbols). Namely, the two definitions (sym and emoji) have inappropriate descriptions, with no final period (the first line of the descriptions on their respective pages should be used instead). Additionally, the "Within Markup Mode" and "Within Math Mode" sub-sections are not listed in the "On This Page" section.

Reproduction URL

https://staging.typst.app/docs/reference/symbols/

Browsers

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OS

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