IBX-4929: PHP API reference: HTML output

[adriendupuis]

Question	Answer
JIRA Ticket	IBX-4929
Versions	4.6.x-dev
Edition	All

HTML for #1904

TODO:

• [ ] keep up to date until release of 4.6.0
• [ ] merge into #1904 before merging #1904

Status: Output of phpdoc.sh with ~~VERSION='4.6.*@dev'; obtaining 4.6.0-beta1 at the moment~~ a trick to get 4.6.x-dev branch: before composer install

rm composer.lock;
sed -i.old 's/"minimum-stability": ".*",/"minimum-stability": "dev",/' composer.json;
composer require ibexa/commerce 4.6.x-dev --no-interaction --ignore-platform-reqs --no-scripts;

Preview: https://ez-systems-developer-documentation--1972.com.readthedocs.build/en/1972/api/php_api/php_api_reference/

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