APPS-9764 Add docs for restart API

[blesswinsamuel]

This PR adds docs for the API to restart apps.

[andrewsomething]

You can add restart to the list here to get the linter passing:

openapi/spectral/functions/validateOpIDNaming.js

Lines 11 to 13 in ed79c72

	const POST = ["create", "post", "add", "tag", "install", "reset", "upgrade",
	"recycle", "run", "retry", "validate", "assign", "unassign", "cancel", "list",
	"destroy", "delete", "update", "attach", "revert", "commit"];

[blesswinsamuel]

Ah! Thanks @andrewsomething for chiming in! Looks like that worked!