yocto-project-qs: Defined Poky and added overview manual link

Fixes [YOCTO #12128]

Updated the phonetic rendition of the term "poky".  Historically,
this term is mispronounced.  I am now saying "Pock-ee" as the official
way of pronouncing this term.

I also added a link to the Yocto Project Overview Manual that was
in the Tip box.  The manual did not exist earlier.  Since it does
exist now, I have added the link.

(From yocto-docs rev: 4ec3fe3b8ee4a680f51f53b919732670b3ffe738)

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

documentation/yocto-project-qs/qs.xml

@@ -28,7 +28,7 @@
             The BitBake and OE components combine together to form
             a reference build host, historically known as
             <ulink url='&YOCTO_DOCS_REF_URL;#poky'>Poky</ulink>
-            (<emphasis>Pah</emphasis>-kee).
+            (<emphasis>Pock</emphasis>-ee).
             Tools exist that facilitate aspects of development such as
             layer creation to isolate your work, emulation for testing
             modules, modification of existing source code, integration of
@@ -47,7 +47,8 @@
                 <itemizedlist>
                     <listitem><para>
                         For more introductory and conceptual information on the
-                        Yocto Project, see the Yocto Project Overview Manual.
+                        Yocto Project, see the
+                        <ulink url='&YOCTO_DOCS_OVERVIEW_URL;'>Yocto Project Overview Manual</ulink>.
                         </para></listitem>
                     <listitem><para>
                         For guidance on where to look for information beyond