Potential updates/improvements to the permissions bitfield documentation

[leydel]

Description

Context: https://discord.com/developers/docs/topics/permissions#permissions-bitwise-permission-flags

Seems like there are some improvements that could be made to this table. I'm not familiar enough with things to make an exhaustive list but here are some things I noticed that at least to my knowledge could be improved:
 

• A legend should be added to define T, V, and S for better clarity (particularly for converting between ChannelType and these)
• ADD_REACTIONS should differentiate in the description between adding new reactions and adding existing reactions, as the latter is still allowed without the permission
• USE_EMBEDDED_ACTIVITIES should say its an option for text channels as well as far as I'm aware
• Are CREATE_GUILD_EXPRESSIONS and CREATE_EVENTS still unavailable? The changelog is from 2023, I'm not familiar with these but that is a while

Steps to Reproduce

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Expected Behavior

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Current Behavior

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Screenshots/Videos

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Client and System Information

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