pkgbase: move man pages from runtime-manual to runtime

[manu]

Summary

We don't split the other man pages in their own package so do the same for runtime.

[bapt]

I don't like the idea of a separated package for manuals

[manu]

In D20962#454420, @bapt wrote:

I don't like the idea of a separated package for manuals

I can merge it with the FreeBSD-runtime package.
I haven't done it because it was like that already, I just want all man pages in their corresponding package.

[bapt]

yes do that please

[emaste]

Sounds good.