sdk-manual, mega-manual: Updated standard SDK install directory figure

The figure was incorrect for the installed file and folder hierarchy
for a standard SDK.  I updated it.  This figure goes in both the sdk-manual
and the mega-manual.

(From yocto-docs rev: a0dc11ce74bba0a18f385d9800f93524340ed033)

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

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

@@ -376,7 +376,7 @@
     </para>
 
     <para>
-        <imagedata fileref="figures/sdk-installed-standard-sdk-directory.png" scale="60" align="center" />
+        <imagedata fileref="figures/sdk-installed-standard-sdk-directory.png" scale="80" align="center" />
     </para>
 
     <para>