Error on performance.timerify(fn) example

[todojs]

The example show

obs.observe({ entryTypes: 'function' });

Must be

obs.observe({ entryTypes: ['function'] });

[jasnell]

Sigh. good catch :-)

[cjihrig]

A fix is in #15406.

[jasnell]

Thanks @cjihrig ... it looked really familiar but couldn't recall off the top of my head.

[todojs]

Ok, it's fixes.

https://github.com/nodejs/node/pull/15406/files/383a4943ea958d110efd2e2577bac5dca9ca7708

(sorry the wrong reopen)