Fix 'double by a factor of two' and make cache options a bit more

descriptive while at it, input and okay jmc@

src/lib/libc/stdlib/malloc.3

@@ -30,7 +30,7 @@
 .\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 .\" SUCH DAMAGE.
 .\"
-.\"	$OpenBSD: malloc.3,v 1.44 2006/04/02 18:22:14 otto Exp $
+.\"	$OpenBSD: malloc.3,v 1.45 2006/06/06 14:49:26 pedro Exp $
 .\"
 .Dd August 27, 1996
 .Dt MALLOC 3
@@ -285,10 +285,10 @@ Fill some junk into the area allocated (see
 except for the exact length the user asked for, which is zeroed.
 .It Cm <
 .Dq Half the cache size .
-Reduce the size of the cache by a factor of two.
+Decrease the size of the free page cache by a factor of two.
 .It Cm >
 .Dq Double the cache size .
-Double the size of the cache by a factor of two.
+Increase the size of the free page cache by a factor of two.
 .El
 .Pp
 So to set a systemwide reduction of cache size and coredumps on problems:
@@ -302,7 +302,7 @@ flags are mostly for testing and debugging.
 If a program changes behavior if either of these options are used,
 it is buggy.
 .Pp
-The default cache size is 16 pages.
+The default number of free pages cached is 16.
 .Sh RETURN VALUES
 The
 .Fn malloc