async_hooks: remove deprecated example · nodejs/node@a6986fe

Original file line number	Diff line number	Diff line change
`@@ -615,14 +615,6 @@ asyncResource.asyncId();`
`615`	`615`
`616`	`616`	`// Return the trigger ID for the AsyncResource instance.`
`617`	`617`	`asyncResource.triggerAsyncId();`
`618`		`-`
`619`		`-// Call AsyncHooks before callbacks.`
`620`		`-// Deprecated: Use asyncResource.runInAsyncScope instead.`
`621`		`-asyncResource.emitBefore();`
`622`		`-`
`623`		`-// Call AsyncHooks after callbacks.`
`624`		`-// Deprecated: Use asyncResource.runInAsyncScope instead.`
`625`		`-asyncResource.emitAfter();`
`626`	`618`	```
`627`	`619`
`628`	`620`	`#### new AsyncResource(type[, options])`