[ptp-dev] Since-tag errors

[Wyatt Spear <wspear@xxxxxxxxxxxxxx>]

Greetings,

In the latest head for ptp I am getting some errors saying that a few @since 5.0 tags are incorrect and need to be @since 6.0.  This is an easy enough fix but I want to be sure it's the right thing to do and that there isn't some alternate releng stuff that I'm missing before I commit.

Thanks,

Wyatt