docs: TouchBar API example

[mattleff]

Description of Change

Corrected TouchBar API example per code:

electron/lib/browser/api/touch-bar.js

Line 32 in edf063b

let { items, escapeItem } = options

This API seems to have changed with #15650.

Checklist

• relevant documentation is changed or added
• PR title follows semantic commit guidelines
• PR release notes describe the change in a way relevant to app developers, and are capitalized, punctuated, and past tense.

Release Notes

Notes: Improved TouchBar API documentation

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[MarshallOfSound]

Good catch, thanks 👍

[release-clerk]

Release Notes Persisted

Improved TouchBar API documentation

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