clarify description for LWP_WSTOP

[Matthew Dillon]

:Discussed-with: Simon 'corecode' Schubert <corecode at fs.ei.tum.de>
:
:...
: #define	LWP_ONRUNQ	0x0000020 /* on a user scheduling run queue */
: #define	LWP_WEXIT	0x0000040 /* working on exiting */
:-#define	LWP_WSTOP	0x0000080 /* working on stopping */
:+#define	LWP_WSTOP	0x0000080 /* has been counted in the process stopped-threads-count */
 
     I will add a more involved comment.

					-Matt
					Matthew Dillon 
					<dillon at backplane.com>