Remove stray empty sections

Here's a couple of small fixes that I need so that publican doesn't
complain about the xml.  It's mostly removing empty sections, but
in one case I had to add some content to make it shut up:

Signed-off-by: Christoph Hellwig <hch@infradead.org>
diff --git a/XFS_Labs/en-US/XFS-allocators-lab.xml b/XFS_Labs/en-US/XFS-allocators-lab.xml
index f774541..5236c90 100644
--- a/XFS_Labs/en-US/XFS-allocators-lab.xml
+++ b/XFS_Labs/en-US/XFS-allocators-lab.xml
@@ -5,7 +5,6 @@
 	<title>XFS Practical Exercises - 03 - Allocators</title>
 	<section>
 		<title>Overview</title>
-		<para></para>
 		<section>
 			<title>Goals</title>
 			<para>This lab demonstrates how inode numbers are sized, and how inodes and extents are 
@@ -13,7 +12,7 @@
 		</section>
 		<section>
 			<title>Prerequisites</title>
-			<para></para>
+			<para>None</para>
 		</section>
 		<section>
 			<title>Setup</title>
@@ -22,7 +21,6 @@
 	</section>
 	<section>
 		<title>Exercises</title>
-		<para></para>
 		<section>
 			<title>Exercise 1</title>
 			<para>This exercise demonstrates how many bits an inode requires to be located anywhere 
diff --git a/XFS_Labs/en-US/XFS-mkfs-mount-lab.xml b/XFS_Labs/en-US/XFS-mkfs-mount-lab.xml
index 1b61875..58ec67c 100644
--- a/XFS_Labs/en-US/XFS-mkfs-mount-lab.xml
+++ b/XFS_Labs/en-US/XFS-mkfs-mount-lab.xml
@@ -36,14 +36,9 @@
 			</itemizedlist>
 
 		</section>
-		<section>
-			<title></title>
-			<para></para>
-		</section>
 	</section>
 	<section>
 		<title>Exercises</title>
-		<para></para>
 		<section>
 			<title>Exercise 1</title>
 			<orderedlist>
@@ -376,6 +371,5 @@
 			group that has free space.  This can cause an unreasonable amount of CPU time to be used 
 			when the filesystem is close to full.</para></listitem>
 		</orderedlist>
-		<para></para>
 	</section>
 </chapter>
diff --git a/XFS_Labs/en-US/XFS-quotas-lab.xml b/XFS_Labs/en-US/XFS-quotas-lab.xml
index 85117f0..43b037d 100644
--- a/XFS_Labs/en-US/XFS-quotas-lab.xml
+++ b/XFS_Labs/en-US/XFS-quotas-lab.xml
@@ -5,7 +5,6 @@
 	<title>XFS Practical Exercises - 05- Quotas</title>
 	<section id="Overview">
 		<title>Overview</title>
-		<para></para>
 		<section id="Goals">
 			<title>Goals</title>
 			<para>The goal of this lab to learn how to use and interpret the XFS quota commands.</para>
@@ -21,7 +20,6 @@
 	</section>
 	<section id="Exercises">
 		<title>Exercises</title>
-		<para></para>
 		<section id="Exercise1">
 			<title>Exercise 1 - Configuring Quotas and Quota Reporting</title>
 			<orderedlist>
@@ -142,7 +140,6 @@
 		</section>
 		<section id="Exercise3">
 			<title>Exercise 3 - Quota Controls (project)</title>
-			<para></para>
 			<orderedlist>
 			<listitem>
 				<para>Add pquota to the mount options for your test file system. You will have to 
diff --git a/XFS_Labs/en-US/XFS-xattr-lab.xml b/XFS_Labs/en-US/XFS-xattr-lab.xml
index c3c4d8a..e21e518 100644
--- a/XFS_Labs/en-US/XFS-xattr-lab.xml
+++ b/XFS_Labs/en-US/XFS-xattr-lab.xml
@@ -240,7 +240,6 @@
 		</section>
 		<section>
 			<title>Exercise 4 – ondisk EA’s in different formats</title>
-			<para></para>
 			<orderedlist>
 			<listitem>
 				<para>Recreate the filesystem</para>
diff --git a/XFS_User_Guide/en-US/XFS-build.xml b/XFS_User_Guide/en-US/XFS-build.xml
index 43c473c..98121fa 100644
--- a/XFS_User_Guide/en-US/XFS-build.xml
+++ b/XFS_User_Guide/en-US/XFS-build.xml
@@ -158,9 +158,6 @@
 			<itemizedlist>
 			<listitem><para>seen as too intrusive, XFS only</para></listitem>
 			</itemizedlist>
-			<itemizedlist>
-			<listitem><para></para></listitem>
-			</itemizedlist>
 		</para></listitem>
 		</itemizedlist>
 		<para>mount (kernel.org)</para>
diff --git a/XFS_User_Guide/en-US/XFS-internals.xml b/XFS_User_Guide/en-US/XFS-internals.xml
index f418a29..97ed8db 100644
--- a/XFS_User_Guide/en-US/XFS-internals.xml
+++ b/XFS_User_Guide/en-US/XFS-internals.xml
@@ -146,8 +146,6 @@
 		<para>resvsp/unresvsp is for allocating but not zeroing</para>
 		<itemizedlist>
 		<listitem><para>efficient way for applications to take advantage of unwritten extents</para></listitem>
-		<listitem><para></para></listitem>
-		<listitem><para></para></listitem>
 		</itemizedlist>
 		<para>posix fallocate has no generic interface to call into the kernel</para>
 		<itemizedlist>
@@ -442,7 +440,6 @@
 		<para>The cycle number is incremented each time we have cycled through the log</para>
 		<para>The metadata in the log is only the metadata that has changed, in theory, but the whole inode tends to be logged.</para>
 		<para>One of the flaws of the xfs logging, is that everything that changed is logged even if sometime later we changed that field again, we still log the original change.</para>
-		<para></para>
 		<itemizedlist>
 		<listitem><para>XFS holy grail is to avoid duplicates in the log</para></listitem>
 		</itemizedlist>
diff --git a/XFS_User_Guide/en-US/XFS-mount.xml b/XFS_User_Guide/en-US/XFS-mount.xml
index 57fec9c..8285d79 100644
--- a/XFS_User_Guide/en-US/XFS-mount.xml
+++ b/XFS_User_Guide/en-US/XFS-mount.xml
@@ -165,7 +165,6 @@
 		<listitem><para>Filesystem will attempt to determine is barriers are supported and will 
 				issue a warning if they are not</para></listitem>
 		<listitem><para>The <command>nobarrier</command> option disables write barriers</para></listitem>
-		<listitem><para></para></listitem>
 		</itemizedlist>
 		<para>See</para>
 		<itemizedlist>
diff --git a/XFS_User_Guide/en-US/XFS-quotas.xml b/XFS_User_Guide/en-US/XFS-quotas.xml
index 6995a55..1a2ad21 100644
--- a/XFS_User_Guide/en-US/XFS-quotas.xml
+++ b/XFS_User_Guide/en-US/XFS-quotas.xml
@@ -218,7 +218,6 @@
 uquotino = 131
 gquotino = 148
 # xfs_db -xr -c 'inode 131' -c p /dev/hdb1</programlisting></para>
-		<para></para>
 	</section>
 	<section>
 		<title>Quotas Ondisk</title>