Set the Author for the document. This metadata can be seen when inspecting the document properties in Adobe Reader.
**Note:** Adobe Reader uses system fonts to display the document metadata, therefore any Unicode text can be used, even if a unibyte codepage is being used for the document.
Defines the text to appear as the Author. The text should be UTF-8 encoded, but should not contain HTML mark-up tags. strcode2utf() is a useful function provided with mPDF which converts HTML numerical entities to UTF-8 encoded string.