phpdoc.php & phpdoc

Hi there,

not sure why phpdoc ends up as phpdoc.php while other elements of the QA/static code analysis toolchain end up as phploc, phpunit, phpcs, etc. rather than phploc.php, phpunit.php, phpcs.php, etc.

I've just added "bin/phpdoc" to the bin array just to make it easier and keep things consistent.

Thanks in advance for merging the PR!

Kind regards,
David