Use JS exponentiation operator in Number doc

[sideshowbarker]

https://github.com/mdn/content/pull/858/files (27c69dc) changed some example code to use 2^53 for exponentiation. But since in JS, the caret doesn’t actually do exponentiation, if you enter 2^53 into the devtools console, it won’t work; it needs to instead be 2**53 — that is, to be runnable code, it needs to use the actual JS exponentiation operator: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Exponentiation

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#858 (comment) is what introduced this mistake. Not sure now what I was thinking — other than I guess I didn’t realize then that this was intended to be showing runnable code (though in code comment).

[github-actions]

Preview URLs

• https://pr4631.content.dev.mdn.mozit.cloud/en-US/docs/Web/JavaScript/Reference/Global_Objects/Number

Flaws

URL: /en-US/docs/Web/JavaScript/Reference/Global_Objects/Number
Title: Number
on GitHub
Flaw count: 1

• macros:
  • /en-US/docs/Web/JavaScript/Reference/Arithmetic%20operators does not exist

External URLs

URL: /en-US/docs/Web/JavaScript/Reference/Global_Objects/Number
Title: Number
on GitHub

• https://en.wikipedia.org/wiki/Floating-point_arithmetic (2 times)
• https://tc39.es/ecma262/ (1 time)
• https://tc39.github.io/ecma262/ (1 time)

[wbamberg]

This is fine.

Actually it wasn't #858 that made this change. I was going to merge that one today, but then I saw the change had already been made in a flaw-fixing PR (#3581, specifically https://github.com/mdn/content/pull/3581/files#diff-80363d7de685750ed7d65e89370cb768a9876bf214cde9e3481ed2af7077d81f ).

The reason to mention that is that it's possible this same fix has been applied in other places too, or at least that in future the flaw-fixing should perhaps convert <sup> into **, rather than ^. CC @nschonni .

FWIW though, although I agree that ** is better in this case for the reason you gave, I don't think it matters too much - it's still correct, just a little less convenient.