[gtkmm-documentation] index-in.docbook: Fix some validation errors

[Kjell Ahlstedt <kjellahl src gnome org>]

commit eda0b6dba02daa02d0d1c033e7fa035aa8a0541c
Author: Kjell Ahlstedt <kjellahlstedt gmail com>
Date:   Thu Apr 25 15:36:02 2019 +0200

    index-in.docbook: Fix some validation errors

 docs/tutorial/C/index-in.docbook | 10 ++++++----
 1 file changed, 6 insertions(+), 4 deletions(-)
---
diff --git a/docs/tutorial/C/index-in.docbook b/docs/tutorial/C/index-in.docbook
index 9c0e4b5..038104b 100644
--- a/docs/tutorial/C/index-in.docbook
+++ b/docs/tutorial/C/index-in.docbook
@@ -2628,8 +2628,10 @@ for (auto iter = children.begin(), end = children.end(); iter != end; ++iter)
   auto row = *iter;
   //Do something with the row - see above for set/get.
 }</programlisting>
+<para>
 If you always want to iterate across the entire range, much more succinct syntax
 is possible using C++'s range-based <literal>for</literal> loop:
+</para>
 <programlisting>
 for (auto row: refModel-&gt;children())
 {
@@ -4723,10 +4725,10 @@ using these <classname>Gtk::Widget</classname> methods:
 <para>There are several methods to add source formats and destination formats.
 Examples:
 <itemizedlist>
-  <listitem><methodname>drag_source_add_text_targets()</methodname></listitem>
-  <listitem><methodname>drag_source_add_image_targets()</methodname></listitem>
-  <listitem><methodname>drag_dest_add_text_targets()</methodname></listitem>
-  <listitem><methodname>drag_dest_add_image_targets()</methodname></listitem>
+  <listitem><para><methodname>drag_source_add_text_targets()</methodname></para></listitem>
+  <listitem><para><methodname>drag_source_add_image_targets()</methodname></para></listitem>
+  <listitem><para><methodname>drag_dest_add_text_targets()</methodname></para></listitem>
+  <listitem><para><methodname>drag_dest_add_image_targets()</methodname></para></listitem>
 </itemizedlist>
 </para>
 </sect1>