ref-manual: Added texinfo class and two new variables.

Added ASSUME_PROVIDED and SANITY_REQUIRED_UTILITIES variable
place-holders.  There is no text there yet but they are there
for placeholders.

(From yocto-docs rev: adfa77dc597303dcff0e95fd4b3ffd5ae2fb08d5)

Signed-off-by: Scott Rifenbark <scott.m.rifenbark@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

documentation/ref-manual/ref-classes.xml

@@ -3112,6 +3112,27 @@
     </para>
 </section>
 
+<section id='ref-classes-texinfo'>
+    <title><filename>texinfo.bbclass</filename></title>
+
+    <para>
+        This class should be inherited by recipes whose upstream packages
+        invoke the <filename>texinfo</filename> utilities at build-time.
+        Native and cross recipes are made to use the dummy scripts provided
+        by <filename>texinfo-dummy-native</filename>, for improved performance.
+        Target architecture recipes use the genuine
+        Texinfo utilities.
+        By default, they use the Texinfo utilities on the host system.
+        <note>
+            If you want to use the Texinfo recipe shipped with the build
+            system, you can remove "texinfo-native" from
+            <link linkend='var-ASSUME_PROVIDED'><filename>ASSUME_PROVIDED</filename></link>
+            and makeinfo from
+            <link linkend='var-SANITY_REQUIRED_UTILITIES'><filename>SANITY_REQUIRED_UTILITIES</filename></link>.
+        </note>
+    </para>
+</section>
+
 <section id='ref-classes-tinderclient'>
     <title><filename>tinderclient.bbclass</filename></title>
 

documentation/ref-manual/ref-variables.xml

@@ -239,6 +239,14 @@
             </glossdef>
          </glossentry>
 
+         <glossentry id='var-ASSUME_PROVIDED'><glossterm>ASSUME_PROVIDED</glossterm>
+            <glossdef>
+                <para>
+                    I need a description here.
+                </para>
+            </glossdef>
+         </glossentry>
+
          <glossentry id='var-AUTHOR'><glossterm>AUTHOR</glossterm>
             <glossdef>
                 <para>The email address used to contact the original author
@@ -7400,6 +7408,14 @@ recipes-graphics/xorg-font/font-alias_1.0.3.bb:PR = "${INC_PR}.3"
             </glossdef>
         </glossentry>
 
+        <glossentry id='var-SANITY_REQUIRED_UTILITIES'><glossterm>SANITY_REQUIRED_UTILITIES</glossterm>
+            <glossdef>
+                <para>
+                    Need a description here.
+                </para>
+            </glossdef>
+        </glossentry>
+
         <glossentry id='var-SANITY_TESTED_DISTROS'><glossterm>SANITY_TESTED_DISTROS</glossterm>
             <glossdef>
                 <para>