docs: Complete helper function documentation (#3911)

* docs: Complete helper function documentation

Complete documentation of the Helper functions

* docs: remove parameters and add a link to source

- Parameters removed
- Link to the file defining the function

* docs: fix links

Fix links to source files
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@ -233,3 +233,84 @@ $html = markdownToHtml($input);
// <li>Translation improvements</li>
// </ul>
```
# e
The `e` function is used to convert special characters to HTML entities
```PHP
e('0 < 1 and 2 > 1');
```
`e` will return the content of the string escape that can be rendered as is in HTML
[Defined in lib/html.php](/lib/html.php)
# truncate
The `truncate` function is used to shorten a string if exceeds a certain length, and add a string indicating that the string has been shortened.
```PHP
truncate('Lorem ipsum dolor sit amet, consectetur adipiscing elit. Sed a neque nunc. Nam nibh sem.', 20 , '...');
```
[Defined in lib/html.php](/lib/html.php)
# sanitize
The `sanitize` function is used to remove some tags from a given HTML text.
```PHP
$html = '<head><title>Sample Page</title></head>
<body><p>Lorem ipsum dolor sit amet, consectetur adipiscing elit...</p>
<iframe src="https://www.example.com" width="600" height="400" frameborder="0" allowfullscreen></iframe>
</body>
</html>';
$tags_to_remove = ['script', 'iframe', 'input', 'form'];
$attributes_to_keep = ['title', 'href', 'src'];
$text_to_keep = [];
sanitize($html, $tags_to_remove, $attributes_to_keep, $text_to_keep);
```
This function returns a simplehtmldom object of the remaining contents.
[Defined in lib/html.php](/lib/html.php)
# convertLazyLoading
The `convertLazyLoading` function is used to convert onvert lazy-loading images and frames (video embeds) into static elements. It accepts the HTML content as HTML objects or string objects. It returns the HTML content with fixed image/frame URLs (same type as input).
```PHP
$html = '<html>
<body style="background-image: url('bgimage.jpg');">
<h1>Hello world!</h1>
</body>
</html>
backgroundToImg($html);
```
[Defined in lib/html.php](/lib/html.php)
# Json::encode
The `Json::encode` function is used to encode a value as à JSON string.
```PHP
$array = [
"foo" => "bar",
"bar" => "foo",
];
Json::encode($array, true, true);
```
[Defined in lib/utils.php](/lib/utils.php)
# Json::decode
The `Json::decode` function is used to decode a JSON string into à PHP variable.
```PHP
$json = '{
"foo": "bar",
"bar": "foo"
}';
Json::decode($json);
```
[Defined in lib/utils.php](/lib/utils.php)