[PATCH wayland] Add missing alt attributes in publican docs.

[Darxus]

Haven't figured out how to regenerate the html, so it's not tested.
Looks like remaining html errors will be fixed in the next publican
release:  https://bugzilla.redhat.com/show_bug.cgi?id=788576

---
 doc/Wayland/en_US/Architecture.xml |   10 ++++++++++
 doc/Wayland/en_US/Book_Info.xml    |    5 +++++
 doc/Wayland/en_US/Overview.xml     |   10 ++++++++++
 3 files changed, 25 insertions(+), 0 deletions(-)

diff --git a/doc/Wayland/en_US/Architecture.xml b/doc/Wayland/en_US/Architecture.xml
index d611fd6..a982176 100644
--- a/doc/Wayland/en_US/Architecture.xml
+++ b/doc/Wayland/en_US/Architecture.xml
@@ -20,6 +20,11 @@
       <imageobject>
 	<imagedata fileref="images/x-architecture.png" format="PNG" />
       </imageobject>
+      <textobject>
+        <phrase>
+          X architecture diagram
+        </phrase>
+      </textobject>
     </mediaobject>
     <para>
       <orderedlist>
@@ -124,6 +129,11 @@
       <imageobject>
 	<imagedata fileref="images/wayland-architecture.png" format="PNG" />
       </imageobject>
+      <textobject>
+        <phrase>
+          Wayland architecture diagram
+        </phrase>
+      </textobject>
     </mediaobject>
     <para>
       <orderedlist>
diff --git a/doc/Wayland/en_US/Book_Info.xml b/doc/Wayland/en_US/Book_Info.xml
index 41f6bbe..856626e 100644
--- a/doc/Wayland/en_US/Book_Info.xml
+++ b/doc/Wayland/en_US/Book_Info.xml
@@ -27,6 +27,11 @@
       <imageobject>
 	<imagedata fileref="images/wayland.png" format="PNG" />
       </imageobject>
+      <textobject>
+        <phrase>
+          Wayland logo
+        </phrase>
+      </textobject>
     </inlinemediaobject>
   </corpauthor>
   <xi:include href="Common_Content/Legal_Notice.xml" xmlns:xi="http://www.w3.org/2001/XInclude" />
diff --git a/doc/Wayland/en_US/Overview.xml b/doc/Wayland/en_US/Overview.xml
index 5e8b4f8..c9990a9 100644
--- a/doc/Wayland/en_US/Overview.xml
+++ b/doc/Wayland/en_US/Overview.xml
@@ -45,6 +45,11 @@
       <imageobject>
 	<imagedata fileref="images/x-architecture.png" format="PNG" />
       </imageobject>
+      <textobject>
+        <phrase>
+          X architecture diagram
+        </phrase>
+      </textobject>
     </mediaobject>
     <para>
       The diagram above illustrates the central role of the X server and
@@ -103,6 +108,11 @@
       <imageobject>
 	<imagedata fileref="images/wayland-architecture.png" format="PNG" />
       </imageobject>
+      <textobject>
+        <phrase>
+          Wayland architecture diagram
+        </phrase>
+      </textobject>
     </mediaobject>
     <para>
       The figure above illustrates how Wayland clients interact with a
-- 
1.7.5.4