docs(sandbox): fix example that defines a non-function property

[MrChocolatine]

Purpose (TL;DR)

This PR follows #2539 and fixes the example that defines a non-function property when using .define().

Solution

This fixes works by following the tests of .define():

sinon/test/sandbox-test.js

Lines 819 to 833 in baa1aee

	it("should define a function property", function () {
	function newFunction() {
	return;
	}
	const object = {};
	this.sandbox.define(object, "property", newFunction);
	assert.equals(object.property, newFunction);
	this.sandbox.restore();
	assert.isUndefined(object.property);
	});

How to verify

1. Check out this branch
2. npm install
3. npm test

Checklist for author

• npm run lint passes
• References to standard library functions are cached.

[codecov]

Codecov Report

Patch and project coverage have no change.

Comparison is base (baa1aee) 95.95% compared to head (83ce3a9) 95.95%.

❗ Current head 83ce3a9 differs from pull request most recent head 53320b1. Consider uploading reports for the commit 53320b1 to get more accurate results

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2543   +/-   ##
=======================================
  Coverage   95.95%   95.95%           
=======================================
  Files          40       40           
  Lines        1904     1904           
=======================================
  Hits         1827     1827           
  Misses         77       77           

Flag	Coverage Δ
unit	95.95% <ø> (ø)

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[fatso83]

Thanks!