`assertPartialHTMLMatchBySelector` docs confusion

Affected Version

4.10

Description

The functional test docs suggest that $this->assertPartialHTMLMatchBySelector will test the element content, but the code actually tests against the outerHTML.

That is to say, the example code in the docs will always fail

$this->assertPartialHTMLMatchBySelector("#MyForm_ID p.error", [
    "That email address is invalid."
]);

it would need to be changed to something like this if we expect it to ever work

$this->assertPartialHTMLMatchBySelector("#MyForm_ID p.error", [
    "<p class=\"error\">That email address is invalid.</p>"
]);

In my case the result I'm getting is

        $this->assertPartialHTMLMatchBySelector('#SaleAdEditForm_getForm_Create_your_account', ['Create your account']);

1) SaleAdEditorPageTest::testCreateAccountWithListing
Failed asserting the CSS selector '#SaleAdEditForm_getForm_Create_your_account' has a partial match to the expected elements:
'Create your account'

Instead the following elements were found:
'<h2 id="SaleAdEditForm_getForm_Create_your_account">Create your account</h2>'
Failed asserting that false is true.

Start with the functional test documentation section linked in the issue and review the assertPartialHTMLMatchBySelector examples alongside the reported failure output. Clarify that matching uses outerHTML, and update the example or explanation so the documented usage matches the actual result. Done means the section no longer implies content-only matching and its example is valid.