[doc patch] Update -funit-at-a-time docs, and fix typos

[Paolo Bonzini]

> I'd prefer one of the hacker guys like Honzo to review this as well,
> but some comments, if you don't mind.

Thanks.  What about this, which includes content from the 3.4.0
release notes?

Paolo

2004-04-20  Paolo Bonzini  <bonzini@gnu.org>

	* doc/invoke.texi (Optimize Options): Refer to
	"unit-at-a-time mode" rather than "-funit-at-a-time"
	since -O2 enables it without requiring -f* options.
	Refer to -fprofile-generate and -fprofile-use
	correctly.  Move -funit-at-a-time among options
	enabled by -O.  Add information about unit-at-a-time
	caveats.

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