addEventListener resides on the protototype

[franktopel]

Summary

addEventListener resides on the protototype property of EventTarget, not on the constructor function itself.

Motivation

Supporting details

Related issues

Metadata

• Adds a new document
• Rewrites (or significantly expands) a document
• Fixes a typo, bug, or other error

[jpmedley]

@ddbeck Does this follow current practice?

[wbamberg]

This is another manifestation of https://github.com/mdn/content/discussions/5121, which did (amazingly) reach a resolution: https://github.com/mdn/content/discussions/5121#discussioncomment-785747 and is I think just waiting for someone to do it.

It proposed as a Q4 2021 Open Web Docs project (openwebdocs/project#55) but got ranked 9, meaning that the OWD team probably won't get to it in Q4. We might get to it in the next quarter, depending how the voting goes. Or it will need a driver from somewhere else (I think there's a fairly small amount of coordination/tracking work, and quite a lot of pretty automatic/mundane work to make the actual updates).

In the meantime I think we should close this PR and the other two.