[TASK] Clean-up PHPdoc in t3lib_div

* fix some PHPdoc comments
* remove @author annotations

Change-Id: If0600e654b785683e1b394154022c650fee7dcda
Resolves: #30066
Releases: 4.6
Reviewed-on: http://review.typo3.org/5093
Reviewed-by: Björn Pedersen
Reviewed-by: Georg Ringer
Tested-by: Georg Ringer
Reviewed-by: Xavier Perseguers
Tested-by: Xavier Perseguers