[Patch docs 2/5] Update "Instruction Patterns" in md.texi

[James Greenhalgh]

Hi,

This patch updates the second section of md.texi - "Everything about
Patterns".

I was aiming to:

  * Remove outdated details of the compiler.
  * Remove long or obscure words that, while accurate, only served to
    obfuscate a simple idea.
  * Refer to similar things in a consistent fashion - in particular
    trying to keep consistent use of "insn" and "pattern".
  * Remove superflous examples, or waffling.

OK?

Thanks,
James

---
2015-01-06  James Greenhalgh  <james.greenhalgh@arm.com>

	* doc/md.texi (Instruction Patterns): Update text.
	(Example): Update text.
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