new build "Cheat sheet" question.

[Jonathan Gibbons]

In the build-infra user guide [1], in section 8, Cheat sheet, it says

set ALT_JDK_IMPORT_PATH=/opt/java/import-jdk or 
ALT_BUILD_JDK_IMPORT_PATH=/opt/java/import-jdk
import JDKs are not used anymore; see elsewhere for discussion about this

It would be nice if the "elsewhere" was linked to somewhere 
appropriate.   I looked "elsewhere" but didn't find anything useful. 
Presumably I didn't look in the right "elsewhere", so it would help to 
know which "elsewhere" contains the relevant discussion.

In particular, it would be good to have a VERY PROMINENT section about 
how you suggest that JDK developers use the new build system as part of 
their daily activities, which typically do not involve using a full forest.

-- Jon

[1] http://openjdk.java.net/projects/build-infra/guide.html