proc.h: fix comment for proc's cached credentials

Per thread cached credentials are accessed only by curproc. Curproc doesn't modify it's 'p_ucred' directly. It allocates new copy, then modyfies newcopy and replaces the old. So 'p_ucred' is owned by curproc. Index: sys/sys/proc.h ===

proc.h: fix comment

After looking at dowait4() I believe this is a typo. Change space to a tab while here. Index: sys/sys/proc.h === RCS file: /cvs/src/sys/sys/proc.h,v retrieving revision 1.213 diff -u -p -r1.213 proc.h --- sys/sys/proc.h 6 Dec 2