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documentation: RCU grace-period memory ordering guarantees 

This commit provides text and diagrams showing how Tree RCU implements
its grace-period memory ordering guarantees.
Signed-off-by: NPaul E. McKenney <paulmck@linux.vnet.ibm.com>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
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Documentation/RCU/Design/Memory-Ordering/Tree-RCU-Diagram.html 0 → 100644
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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
"http://www.w3.org/TR/html4/loose.dtd">
<html>
<head><title>A Diagram of TREE_RCU's Grace-Period Memory Ordering</title>
<meta HTTP-EQUIV="Content-Type" CONTENT="text/html; charset=iso-8859-1">
<p><img src="TreeRCU-gp.svg" alt="TreeRCU-gp.svg">
</body></html>
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