feat(wait/doc): complete page

[PsychoShock]

This will mostly show:

• What is Citizen.Wait
• How does it work
• Example
• Where to use it
• Tips

[TheIndra55]

In my opinion this has too much filler, while leaving out important details like that it yields "thread"/coroutine so the game can render the next frame. You should probably just extend the current page and include two examples; one example showing a 2 seconds wait, and another one explaining how/why we need the Wait(0) you see often in loops.

[PsychoShock]

Credits to @AvarianKnight for the "Things to keep in mind" part. Thanks.