[AArch64 Documentation] Clarify meaning of -mcpu, -mtune, -march

[James Greenhalgh]

Hi,

These three options can be a pain to remember how they interact
with one another, this patch clarifies the situation giving explicit
documentation as to the expected behaviour where they are combined.

OK?

Thanks,
James

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gcc/

2014-01-20  James Greenhalgh  <james.greenhalgh@arm.com>

	* doc/invoke.texi (-march): Clarify documentation for AArch64.
	(-mtune): Likewise.
	(-mcpu): Likewise.
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