documentation: Changed section title for required packages.

The title needs to use the terminology "Build Host" to be consistent
with the manual set.  I updated the title and the many links into that
section.

(From yocto-docs rev: 930030433e58e6180ee4f95e559d079c3899defc)

Signed-off-by: Scott Rifenbark <srifenbark@gmail.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

documentation/ref-manual/ref-release-process.xml

@@ -189,7 +189,7 @@
                     Running <filename>oe-selftest</filename> requires
                     host packages beyond the "Essential" grouping.
                     See the
-                    "<link linkend='required-packages-for-the-host-development-system'>Required Packages for the Host Development System</link>"
+                    "<link linkend='required-packages-for-the-build-host'>Required Packages for the Build Host</link>"
                     section for more information.
                 </note>
                 </para></listitem>

documentation/ref-manual/ref-system-requirements.xml

@@ -132,8 +132,8 @@
         </note>
     </section>
 
-    <section id='required-packages-for-the-host-development-system'>
-    <title>Required Packages for the Host Development System</title>
+    <section id='required-packages-for-the-build-host'>
+    <title>Required Packages for the Build Host</title>
 
         <para>
             The list of packages you need on the host development system can

documentation/ref-manual/ref-terms.xml

@@ -329,7 +329,7 @@
                 <para>It is worth noting that the term "package" can,
                 in general, have subtle meanings.
                 For example, the packages referred to in the
-                "<link linkend='required-packages-for-the-host-development-system'>Required Packages for the Host Development System</link>"
+                "<link linkend='required-packages-for-the-build-host'>Required Packages for the Build Host</link>"
                 section are compiled binaries that, when installed, add
                 functionality to your Linux distribution.</para>