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docs: Added mention of Kerberos for CURL_VERSION_SSPI
As this has been present for SOCKSv5 proxy since v7.19.4 and for IMAP, POP3 and SMTP authentication since v7.38.0.
As this has been present for SOCKSv5 proxy since v7.19.4 and for IMAP, POP3 and SMTP authentication since v7.38.0.