bhyve.8: Improve the description of the -m flag

- Stylize the synopsis with proper mdoc macros
- Do some wordsmithing on the description for consistency.

MFC after:	2 weeks

1 files changed, 15 insertions, 7 deletions

diff --git a/usr.sbin/bhyve/bhyve.8 b/usr.sbin/bhyve/bhyve.8
index 3105dbca016a..051ca05d85e5 100644
--- a/usr.sbin/bhyve/bhyve.8
+++ b/usr.sbin/bhyve/bhyve.8
@@ -184,18 +184,26 @@ The possible values for the
 argument are listed in the
 .Fl s
 flag description.
-.It Fl m Ar memsize Ns Op Ar K|k|M|m|G|g|T|t
-Guest physical memory size in bytes.
+.It Xo
+.Fl m Ar memsize Ns Oo
+.Sm off
+.Cm K | k | M | m | G | g | T | t
+.Sm on
+.Oc
+.Xc
+Set the guest physical memory size
 This must be the same size that was given to
 .Xr bhyveload 8 .
 .Pp
-The size argument may be suffixed with one of K, M, G or T (either upper
-or lower case) to indicate a multiple of kilobytes, megabytes, gigabytes,
-or terabytes.
+The size argument may be suffixed with one of
+.Cm K , M , G
+or
+.Cm T
+(either upper or lower case)
+to indicate a multiple of kilobytes, megabytes, gigabytes, or terabytes.
 If no suffix is given, the value is assumed to be in megabytes.
 .Pp
-.Ar memsize
-defaults to 256M.
+The default is 256M.
 .It Fl o Ar var Ns Cm = Ns Ar value
 Set the configuration variable
 .Ar var