[patch] add links in 21_strings/howto.html

[Jonathan Wakely]

The Sutter and Austern articles on case-insensitive string have been
available online for a while now.

2007-12-09  Jonathan Wakely  <...>

        * docs/html/21_strings/howto.html: Add links to referenced articles.

I'll commit to mainline in a couple of days if noone objects.

Jon
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