change sdk version variable to 2.3 (for docs)

Change-Id: I76f5c69fab08913543c4f3d1ab000f7c4b6c9574
diff --git a/Android.mk b/Android.mk
index 83bdc0e..2320c46 100644
--- a/Android.mk
+++ b/Android.mk
@@ -441,7 +441,7 @@
 
 ## SDK version identifiers used in the published docs
   # major[.minor] version for current SDK. (full releases only)
-framework_docs_SDK_VERSION:=2.2
+framework_docs_SDK_VERSION:=2.3
   # release version (ie "Release x")  (full releases only)
 framework_docs_SDK_REL_ID:=1
   # flag to build offline docs for a preview release