[PATCH][AARCH64]Document .arch and .arch_extension directive in GAS c-aarch64.texi

[Renlin Li]

Hi all,

This is a simple patch to add .arch and .arch_extension directive 
documentation into c-aarch64.texi.

arch64-none-elf has been built, no new issue. Documentations of html and 
info format are both checked.

Okay to commit?

gas/ChangeLog:

2014-11-24  Renlin Li  <Renlin.Li@arm.com>

     * doc/c-aarch64.texi (.arch): Document the directive.
     (.arch_extension): Likewise.


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