Change definition for varargs

[simPod]

This would allow to properly render all arguments definitions

• arguments
• arguments by reference
• varible-length argument lists
• varible-length argument lists passed by reference

See php/phd#24 and salathe/phpdoc-base#2

This is an example of what would have been needed to be done

[cmb69]

This is now handled somewhat differently, but still this PR can be closed.