documentation: Terminology fix for "OpenEmbedded Layer Index"

Found several instances of this being referred to as the
"OpenEmbedded Metadata Index".  Changed to "OpenEmbedded Layer
Index".

(From yocto-docs rev: 60fb601be324a350cd4d51b199915e6b72e2f9b0)

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

documentation/toaster-manual/toaster-manual-intro.xml

@@ -38,7 +38,7 @@
                             Browse layers listed in the various
                             <link linkend='layer-source'>layer sources</link>
                             that are available in your project (e.g. the
-                            OpenEmbedded Metadata Index at
+                            OpenEmbedded Layer Index at
                             <ulink url='http://layers.openembedded.org/layerindex/'></ulink>).
                             </para></listitem>
                         <listitem><para>

documentation/toaster-manual/toaster-manual-reference.xml

@@ -34,7 +34,7 @@
             A layer index is a web application that contains information
             about a set of custom layers.
             A good example of an existing layer index is the
-            OpenEmbedded Metadata Index.
+            OpenEmbedded Layer Index.
             A public instance of this layer index exists at
             <ulink url='http://layers.openembedded.org'></ulink>.
             You can find the code for this layer index's web application at

documentation/toaster-manual/toaster-manual-setup-and-use.xml

@@ -535,7 +535,7 @@
           <itemizedlist>
               <listitem><para>
                   Browse published layers in the
-                  <ulink url='http://layers.openembedded.org'>OpenEmbedded Metadata Index</ulink>
+                  <ulink url='http://layers.openembedded.org'>OpenEmbedded Layer Index</ulink>
                   that are available for your selected version of the build
                   system.
                   </para></listitem>