ref-manual: Fleshed out the do_compile task.

Fixes [YOCTO #9964]

Added more detailed information to the do_compile task.  Also, provided
some information about oe_runmake in the base.bbclass refrence.
Finally, put some detail in the "Shared State" section concerning
do_deploy[dirs].

(From yocto-docs rev: 5d0612a57cc8e035a2194ada21e65055ef2b8a2e)

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

documentation/ref-manual/ref-classes.xml

@@ -194,7 +194,14 @@
         class or the
         <link linkend='ref-classes-package'><filename>package</filename></link>
         class.
+    </para>
+
+    <para>
         The class also contains some commonly used functions such as
+        <filename>oe_runmake</filename>, which runs
+        <filename>make</filename> with the arguments specified in
+        <link linkend='var-EXTRA_OEMAKE'><filename>EXTRA_OEMAKE</filename></link>
+        variable as well as the arguments passed directly to
         <filename>oe_runmake</filename>.
     </para>
 </section>