Enhance URL Twig functions doc

[adriendupuis]

Question	Answer
JIRA Ticket	CS-11493 for cross-SiteAccess
Versions	4.5+
Edition	All

• Add an equivalent to 2.5/guide/siteaccess/#cross-siteaccess-links which was missing from 3.3 and 4.x
• ibexa.url.alias
  • Avoid usage confusion by removing the parenthesis which make it looks like a function.
  • Add an example usage with path.
  • Fix anchor from table to section

TODO:

• Maybe add an available parameter list
• Test cross-SiteAccess links with dedicated domains (Map\Host), multiple repositories, …

Checklist

• [ ] Text renders correctly
• [ ] Text has been checked with vale
• [ ] Description metadata is up to date
• [ ] Redirects cover removed/moved pages
• [ ] Code samples are working
• [ ] PHP code samples have been fixed with PHP CS fixer
• [ ] Added link to this PR in relevant JIRA ticket or code PR

[adriendupuis]

As an early test of cross-SiteAccess, on a 4.5.3 clean install, I added the following at the top of templates/themes/standard/full/welcome_page.html.twig's {% block content %}:

    {{ ibexa_path(ibexa_route("ibexa.url.alias", { 'locationId': 42, 'siteaccess': 'admin' })) }}
    <br/>
    {{ path('ibexa.url.alias', { 'locationId': 42, 'siteaccess': 'admin' }) }}
    <br/>
    {{ ibexa_url(location, {'siteaccess': 'admin'}, false) }}
    <br/>
    {{ ibexa_url(location, {'siteaccess': 'admin'}, true) }}