doc: disk-utils/*: Fix some warnings from "mandoc -T lint"

mandoc: ./disk-utils/fsck.minix.8:123:2: WARNING: skipping paragraph macro: PP empty

mandoc: ./disk-utils/isosize.8:8:2: WARNING: skipping paragraph macro: PP after SH

mandoc: ./disk-utils/sfdisk.8:262:4: STYLE: unterminated quoted argument

mandoc: ./disk-utils/swaplabel.8:57:2: WARNING: skipping paragraph macro: PP empty

####

  No change in the output from "nroff" or "groff".

Signed-off-by: Bjarni Ingi Gislason <bjarniig@rhi.hi.is>

####

disk-utils/fsck.minix.8

@@ -120,7 +120,6 @@ Operational error
 Usage or syntax error
 .PD
 .RE
-.PP
 .SH AUTHORS
 .MT torvalds@\:cs.\:helsinki.\:fi
 Linus Torvalds

disk-utils/isosize.8

@@ -5,7 +5,6 @@ isosize \- output the length of an iso9660 filesystem
 .B isosize
 .RI [options] " iso9660_image_file"
 .SH DESCRIPTION
-.PP
 This command outputs the length of an iso9660 filesystem that
 is contained in the specified file.  This file may be a normal file or
 a block device (e.g.\& /dev/hdd or /dev/sr0).  In the absence of

disk-utils/sfdisk.8

@@ -259,7 +259,7 @@ and the last command reorders partitions to match disk order
 .sp
 .B "echo '+100M,' | sfdisk \-\-move-data /dev/sdc \-N 1"
 .br
-.B "echo '2048,' | sfdisk /dev/sdc \-\-append
+.B "echo '2048,' | sfdisk /dev/sdc \-\-append"
 .br
 .B sfdisk /dev/sdc \-\-reorder
 .sp

disk-utils/swaplabel.8

@@ -54,7 +54,6 @@ Specify a new \fIUUID\fR for the device.
 The \fI UUID\fR
 must be in the standard 8-4-4-4-12 character format, such as is output by
 .BR uuidgen (1).
-.PP
 .SH ENVIRONMENT
 .IP LIBBLKID_DEBUG=all
 enables libblkid debug output.