Add $createServerInvite In the docs

[Khothos]

Code of Conduct

• [X] I have read and agree to the aoijs docs project's Code of Conduct

What function on aoi.js.org is affected?

$createServerInvite

What parts of the function would you like to see updated?

Added usage, and example of $createServerInvite in the aoijs docs

Additional information

No response

[Khothos]

Addtional info : Usage : ```js $createServerInvite[guildID?;...options]