document missing Xtensa option in GAS overview

[Bob Wilson]

I noticed recently that the --rename-section option for the Xtensa port of GAS 
is documented in the "Xtensa Options" section but not in the "Overview".  This 
patch fixes that.  I tested a build to make sure that the info file builds OK. 
Committed on trunk.

2007-10-16  Bob Wilson  <bob.wilson@acm.org>
	
	* doc/as.texinfo (Overview): Add Xtensa --rename-section option.
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