doc: DESIGN: update old statements.

The statement about C exts hasn't been true since 2010 when kgio was
unfortunately introduced.  However, I've been working on killing off
kgio.  Maybe raindrops isn't worth it given the limits of SMP, either.
And I'm even tempted to rewrite the HTTP parser in Ruby...

Furthermore, Ruby Enterprise Edition is long gone and Ruby 2.0
is already old, so update that bit about CoW-friendliness.

While we're at it, avoid mentioning kgio at all in the Links
document, too.

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