Well, phpdoc are annotations. Not all annotations placed inside the docComment are phpdoc. One set is included in the other one, but they are not the same set. Doctrine annotations are also annotations, but they are not phpdoc.

phpdoc is a set of annotations to document the API of the code. Note that the guys from PhpDocumentor have even submitted a PSR (currently referenced as PSR-5 IIRC) to define this standard explicitly, making it easier for different IDEs to know what they need to support.