Doc change: update logo for samples, several edits.

Change-Id: I9045f51578f211301a5feb20423b4aa3a5fa2d94
diff --git a/docs/html/training/index.jd b/docs/html/training/index.jd
index 3e0d593..1b0b1fe 100644
--- a/docs/html/training/index.jd
+++ b/docs/html/training/index.jd
@@ -37,6 +37,6 @@
        data-query="collection:develop/landing/courses"
        data-sortOrder="random"
        data-cardSizes="6x6"
-       data-maxResults="9"
+       data-maxResults="12"
        data-initial-results="3"></div>
 </div>
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