[gc-improv] Update documentation

[Laurynas Biveinis]

This documents the new GTY option variable_size and replaces GC
allocation in existing examples to use the typed allocation.

Tested by make info and make pdf, committed to gc-improv branch.

-- 
Laurynas


2010-03-19  Laurynas Biveinis  <laurynas.biveinis@gmail.com>

	* doc/gty.texi (GTY Options): Use typed GC allocation in
	examples.  Document variable_size option.
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