libutil: Fix mandoc warnings

- missing comma before name
- possible typo in section name: Sh CAVEAT instead of CAVEATS
- useless macro: Tn
- blank line in fill mode, using .sp
- no blank before trailing delimiter: Dv NULL?

MFC after:	3 days

lib/libutil/humanize_number.3

@@ -183,12 +183,8 @@ The
 and
 .Dv HN_IEC_PREFIXES
 flags
-conform to
-.Tn ISO/IEC
-Std\~80000-13:2008
-and
-.Tn IEEE
-Std\~1541-2002.
+conform to ISO/IEC Std\~80000-13:2008
+and IEEE Std\~1541-2002.
 .Sh HISTORY
 The
 .Fn humanize_number

lib/libutil/kinfo_getvmmap.3

@@ -58,13 +58,6 @@ with the
 mib.
 While the kernel returns a packed structure, this function expands the
 data into a fixed record format.
-.Sh CAVEAT
-.Fn kinfo_getvmmap
-calls can cause significant CPU consumption because calculating the residency
-counts requires iterating over all memory pages of the process.
-Setting the sysctl variable
-.Va kern.proc_vmmap_skip_resident_count
-to 1 prevents this calculation.
 .Sh RETURN VALUES
 On success the
 .Fn kinfo_getvmmap
@@ -89,3 +82,10 @@ The
 .Fn kinfo_getvmmap
 function first appeared in
 .Fx 7.0 .
+.Sh CAVEATS
+.Fn kinfo_getvmmap
+calls can cause significant CPU consumption because calculating the residency
+counts requires iterating over all memory pages of the process.
+Setting the sysctl variable
+.Va kern.proc_vmmap_skip_resident_count
+to 1 prevents this calculation.

lib/libutil/login_tty.3

@@ -68,4 +68,3 @@ The function
 .Fn login_tty
 first appeared in
 .Bx 4.4 .
-

lib/libutil/pty.3

@@ -149,7 +149,7 @@ The
 and
 .Fn forkpty
 functions first appeared in
-.Bx 4.3 Reno.
+.Bx 4.3 Reno .
 .Sh BUGS
 .Fn openpty
 writes the slave terminal's name to

lib/libutil/pw_util.3

@@ -191,7 +191,7 @@ it will default to
 .Fa master
 is the name of the password file.
 If set to
-.Dv NULL?
+.Dv NULL ?
 it will default to
 .Pa master.passwd
 .Pp

lib/libutil/quotafile.3

@@ -29,17 +29,17 @@
 .Dt QUOTAFILE 3
 .Os
 .Sh NAME
-.Nm quota_open
-.Nm quota_close
-.Nm quota_on
-.Nm quota_off
-.Nm quota_read
-.Nm quota_write_limits
-.Nm quota_write_usage
-.Nm quota_fsname
-.Nm quota_qfname
-.Nm quota_maxid
-.Nm quota_check_path
+.Nm quota_open ,
+.Nm quota_close ,
+.Nm quota_on ,
+.Nm quota_off ,
+.Nm quota_read ,
+.Nm quota_write_limits ,
+.Nm quota_write_usage ,
+.Nm quota_fsname ,
+.Nm quota_qfname ,
+.Nm quota_maxid ,
+.Nm quota_check_path ,
 .Nm quota_convert
 .Nd "Manipulate quotas"
 .Sh LIBRARY