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Document the p argument of vgonel(9) and vrecycle(9).

Spotted by schwarze@, discussed with kn@ and schwarze@

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.Dd $Mdocdate: August 5 2020 $
.Dt VRECYCLE 9
.Os
.Sh NAME
.Nm vrecycle
.Nd recycle a vnode if its reference count is zero
.Sh SYNOPSIS
.In sys/param.h
.In sys/vnode.h
.Ft int
.Fo vrecycle
.Fa "struct vnode *vp"
.Fa "struct proc *p"
.Fc
.Sh DESCRIPTION
The
.Fn vrecycle
function places the vnode
.Fa vp
on the free list using
.Xr vgonel 9
if its
.Va v_usecount
field is zero.
If
.Va v_usecount
is non-zero, it simply returns.
The
.Fa p
argument specifies the process responsible for the call.
.Sh RETURN VALUES
.Fn vrecycle
will return 1 if the vnode was placed on the free list.
It will return 0 if the reference count was non-zero.
.Sh SEE ALSO
.Xr vgonel 9 ,
.Xr vnode 9
.Sh HISTORY
This man page was originally written for
.Ox .