Small usage update for tutorial template

(cherry picked from commit 529a3f70)

tutorials/README.md

@@ -11,8 +11,8 @@ Place each tutorial and its illustrations into a subdirectory. An example is
 basic/ with the Basic Tutorial.
 
 Copy and use `template.xml` as skeleton to creating new tutorial source.
-You find supported DocBook tags in this template. Please use unly this tags and
-preserve structure. You can validate XML width `xmllint --valid --noout your-tutorial.xml`
+You find supported DocBook tags in this template. Please use only these tags and
+preserve structure. You can validate XML width `xmllint --postvalid --noout your-tutorial.xml`
 
 Create figures with provided template (`template-figure.svg`). Please
 preserve canvas width (300px) and update canvas height to the content without margins

tutorials/template.xml

@@ -6,10 +6,12 @@
       <title>Title of the tutorial</title>
       <subtitle>Tutorial</subtitle>
       <author>
-        <firstname>Your firsname</firstname>
-        <surname>Your last name</surname>
+        <othername>Your name</othername>
         <email>your.email@address.com</email>
       </author>
+      <!-- To create author list directly from git log replace <author> tag above with the following line.
+      <xi:include xmlns:xi="http://www.w3.org/2001/XInclude" href="tutorial-ID-OF-THE-TUTORIAL-authors.xml" />
+      -->
     </articleinfo>
     <abstract>
       <para>