Help: Add notes for topic 'add-GreenHills-MULTI-generator'

Help/release/dev/add-GreenHills-MULTI-generator.rst

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+add-GreenHills-MULTI-generator
+------------------------------
+
+* A new experimental :generator:`Green Hills MULTI` generator was
+  added on Windows.  `Green Hills MULTI`_ is an IDE for embedded
+  real-time systems.
+
+.. _`Green Hills MULTI`: http://www.ghs.com/products/MULTI_IDE.html