Fix references to https://sites.google.com/site/skiadocs/.

Point them to their equivalent in https://skia.org.

BUG=None
R=hcm@google.com, jcgregorio@google.com
NOTRY=true

Review URL: https://codereview.chromium.org/856353004
diff --git a/resources/slides_content2.lua b/resources/slides_content2.lua
index 3b4eb09..2b293a2 100644
--- a/resources/slides_content2.lua
+++ b/resources/slides_content2.lua
@@ -1,8 +1,8 @@
 Skia Update
 
 Skia : Access
-- code.google.com/p/skia
-- sites.google.com/site/skiadocs
+- https://skia.org
+- https://skia.googlesource.com/skia
 
 Skia : Overview
 - portable graphics engine