[wwwdocs] Fix some nits in GCC 4.7 changes.html

[Rainer Orth]

While reading through the GCC 4.7 changes.html, I noticed a couple of
nits that this patch fixes.  It's mostly wording and grammar changes (so
I may well be wrong and would appreciate a native speaker having a look ;-)

Ok to install?

Beyond what I've changed, two items could perhaps do with better
explanations, especially since the document is intended to be directed
at compiler users, not compiler developers:

* LTO improvements:

  Streaming performance (both outbound and inbound) has been improved.

  What is this and why should I care?

* IA-32/x86-64:

  Support for new Intel processor codename IvyBridge with RDRND,
  FSGSBASE and F16C

  Support for the new Intel processor codename Haswell with AVX2, FMA,
  BMI, BMI2, LZCNT
  
  Better: with the ... extensions?  Add links?

	Rainer


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Rainer Orth, Center for Biotechnology, Bielefeld University