gty.texi (GTY Options): Clarify that variable_size produces allocators taking size...

gty.texi (GTY Options): Clarify that variable_size produces allocators taking size in bytes...

2010-11-09  Laurynas Biveinis  <laurynas.biveinis@gmail.com>

	PR/46268
	* doc/gty.texi (GTY Options): Clarify that variable_size produces
	allocators taking size in bytes, compare with length option.  Add
	size calculation example.
	(Invoking the garbage collector): Ensure that sentences are
	followed by two spaces.  Describe that pointer fields must be
	initialized at ggc_collect call.
	(Troubleshooting): New section.

From-SVN: r166519