[PHP-NOTES] note 130301 added to language.attributes.overview

Attributes are classes, and if you are in a namespace, remember to fully qualify the namespace in the attribute or add a use statement.

```
namespace MyProject;

/* This will not work */
#[AllowDynamicProperties]

/* This will work */
#[\AllowDynamicProperties]
```
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Manual Page -- https://php.net/manual/en/language.attributes.overview.php
Edit        -- https://main.php.net/note/edit/130301
Del: integrated  -- https://main.php.net/note/delete/130301/integrated
Del: useless     -- https://main.php.net/note/delete/130301/useless
Del: bad code    -- https://main.php.net/note/delete/130301/bad+code
Del: spam        -- https://main.php.net/note/delete/130301/spam
Del: non-english -- https://main.php.net/note/delete/130301/non-english
Del: in docs     -- https://main.php.net/note/delete/130301/in+docs
Del: other reasons-- https://main.php.net/note/delete/130301
Reject      -- https://main.php.net/note/reject/130301
Search      -- https://main.php.net/manage/user-notes.php