dev-manual, sdk-manual: Fixed link to Eclipse section

The YP doc set was using a link to an out-dated video that
showed how to configure and run Eclipse.  The video was very
old and Jessica suggested just removing it.  So, I replaced
all occurrences of the link to the up-to-date appendix in the
SDK manual that provides information on the latest supported
version of the Eclipse IDE.

(From yocto-docs rev: b4af1a79078352df5558e20c0b9cfa97fa141abc)

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

documentation/sdk-manual/sdk-appendix-mars.xml

@@ -2,7 +2,7 @@
 "http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd"
 [<!ENTITY % poky SYSTEM "../poky.ent"> %poky; ] >
 
-<appendix id='sdk-appendix-mars'>
+<appendix id='sdk-appendix-latest-yp-eclipse-plug-in'>
     <title>Using Eclipse Mars</title>
 
     <para>

documentation/sdk-manual/sdk-working-projects.xml

@@ -459,7 +459,7 @@
                     release with the Yocto Project.
                     For information on how to use the Mars version of Eclipse
                     with the Yocto Project, see
-                    "<link linkend='sdk-appendix-mars'>Appendix C</link>.
+                    "<link linkend='sdk-appendix-latest-yp-eclipse-plug-in'>Appendix C</link>.
                 </note>
             </para>