Handle markdown tables in descriptions/params

[luttje]

Markdown tables aren't supported by LuaLS so tables like those in Entity:Dissolve are possibly problematic:

We should strip or reformat them

Also happens for:

• https://wiki.facepunch.com/gmod/hammer.SendCommand
• https://wiki.facepunch.com/gmod/net.WriteInt
• https://wiki.facepunch.com/gmod/net.WriteUInt
• https://wiki.facepunch.com/gmod/os.date
• https://wiki.facepunch.com/gmod/string.format

[TIMONz1535]

One solution is to move this into a long comment.