[Xtensa Gas Patch] Use new man page feature

[Sterling Augustine]

I have committed the following patch which follows the several others in 
using the new "document gas target-specific options in only one place" 
feature.

Sterling

2010-11-23  Sterling Augustine  <sterling@tensilica.com>

	* doc/as.texinfo: Refer to and include c-xtensa.texi for Xtensa
	options.  Move Xtensa options to proper alphabetical location.
	* doc/c-xtensa.texi: Add markup for use in manpage generation.

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