Update SDK doc API 18 package to revision 2.

Summary: method getDhcpInfo() is being un-deprecated and
a new version of API 18 doc should be released for the SDK.

Bug: 10003785
Change-Id: I8f790f21ade23c8894046c27ad9027fc7cb42687
(cherry picked from commit f19416c38811a90e88b55be87d7429704875a3ba)
diff --git a/sdk/doc_source.prop_template b/sdk/doc_source.prop_template
index d3cdfd5..523d6bd 100644
--- a/sdk/doc_source.prop_template
+++ b/sdk/doc_source.prop_template
@@ -1,4 +1,4 @@
 Pkg.UserSrc=false
-Pkg.Revision=1
+Pkg.Revision=2
 AndroidVersion.ApiLevel=${PLATFORM_SDK_VERSION}
 AndroidVersion.CodeName=${PLATFORM_VERSION_CODENAME}