Adjusts section 1 of release(8) to make it correct with Bitrig reality.
Initial bits for a complete rework over release(8).
Xr git(1) instead of cvs(1), while here, manually update .Dd, since
nothing will trigger $Mdocdate$ updating, it is a cvs keyword.
Introduces sources(7), a manual page to summarize information on Bitrig
system's source management code and kernel/userland building. This is
one more step towards a rework in the field of online information
resouces, specific for Bitrig's sources management, build and release
procedures.
Adding a few Xr to sources(7) from afterboot(8) and config(8)