[src/trunk]: src/share/man/man9 Use more markup. Bump date for previous.

[wiz <wiz%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/9234d55d5302
branches:  trunk
changeset: 353377:9234d55d5302
user:      wiz <wiz%NetBSD.org@localhost>
date:      Tue May 02 08:20:20 2017 +0000

description:
Use more markup. Bump date for previous.

diffstat:

 share/man/man9/mutex.9 |  15 ++++++++++-----
 1 files changed, 10 insertions(+), 5 deletions(-)

diffs (37 lines):

diff -r 6073de8dc9d5 -r 9234d55d5302 share/man/man9/mutex.9
--- a/share/man/man9/mutex.9    Tue May 02 08:11:16 2017 +0000
+++ b/share/man/man9/mutex.9    Tue May 02 08:20:20 2017 +0000
@@ -1,4 +1,4 @@
-.\"    $NetBSD: mutex.9,v 1.27 2017/05/01 21:36:01 pgoyette Exp $
+.\"    $NetBSD: mutex.9,v 1.28 2017/05/02 08:20:20 wiz Exp $
 .\"
 .\" Copyright (c) 2007, 2009 The NetBSD Foundation, Inc.
 .\" All rights reserved.
@@ -27,7 +27,7 @@
 .\" ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 .\" POSSIBILITY OF SUCH DAMAGE.
 .\"
-.Dd September 4, 2013
+.Dd May 1, 2017
 .Dt MUTEX 9
 .Os
 .Sh NAME
@@ -177,10 +177,15 @@
 Mutexes may be released out of order as needed.
 .It Fn mutex_ownable "mtx"
 .Pp
-When compiled with LOCKDEBUG (see
+When compiled with
+.Dv LOCKDEBUG
+(see
 .Xr options 4 ) ,
-ensure that the current process can successfully acquire mtx.
-If mtx is already owned by the current process, the system will panic
+ensure that the current process can successfully acquire
+.Ar mtx .
+If
+.Ar mtx
+is already owned by the current process, the system will panic
 with a "locking against myself" error.
 .Pp
 This function is needed because