callback is not a valid parameter type

[johnbillion]

In many of our docblocks, callback is used as a @param type. This is not a valid type in PHP, PSR-5, or phpDocumentor, which all use callable.

Refs:

• ​http://uk1.php.net/manual/en/language.types.callable.php
• ​https://github.com/phpDocumentor/fig-standards/blob/master/proposed/phpdoc.md#keyword
• ​http://www.phpdoc.org/docs/latest/guides/types.html

[DrewAPicture]

Wow, I've fixed a few here and there but I had no idea there were so many uses of callback out there.

[johnbillion]

In 34566:

callback is not a valid type in PHP, PSR-5, or phpDocumentor. callable should be used instead.

Fixes #34032