[Sync-EN] Fix the Uri\WhatWg\Url screens that ignore URL normalization

[lacatoire]

Syncs the three reference/uri/uri/whatwg/url/ pages with php/doc-en#5721.

The example outputs did not match what the code actually prints, because they ignored WHATWG URL normalization:

• getPort(): the example used https://example.com:443 and claimed it prints 443. 443 is the default port for https, so it is not stored and getPort() returns null. The example now shows both cases, with var_dump().
• withPort(): same problem; withPort(443) on an https URL yields null, and a second call with 8443 shows a non-default port being kept.
• parse(): toAsciiString() on https://example.com prints https://example.com/, with the normalized trailing slash.

EN-Revision bumped to 0e06411471a898974e114bd57f624781fe3a0b89 on the three files.

Fixes: #1610