[patch]: document SHA-2 support in glibc crypt()

[Leonid Evdokimov]

Hello!

I'd like to see few more lines about SHA-2 support in glibc crypt() in
documentation. I've created small patch for nginx.org repo, it's
attached.

-- 
WBRBW, Leonid Evdokimov, xmpp:leon at darkk.net.ru http://darkk.net.ru tel:+79816800702
PGP: 6691 DE6B 4CCD C1C1 76A0  0D4A E1F2 A980 7F50 FAB2
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