CURLOPT_TLSAUTH_TYPE.3: update description

.SH SYNOPSIS

#include <curl/curl.h>

CURLcode curl_easy_setopt(CURL *handle, CURLOPT_TLSAUTH_TYPE, long bitmask);

CURLcode curl_easy_setopt(CURL *handle, CURLOPT_TLSAUTH_TYPE, char *type);

.SH DESCRIPTION

Pass a long as parameter, which is set to a bitmask, to tell libcurl which

authentication method(s) you want it to use for TLS authentication.

Pass a pointer to a zero terminated string as parameter. The string

should be the method of the TLS authentication. Supported method is "SRP".

.IP CURL_TLSAUTH_SRP

.IP SRP

TLS-SRP authentication. Secure Remote Password authentication for TLS is

defined in RFC5054 and provides mutual authentication if both sides have a

shared secret. To use TLS-SRP, you must also set the

\fICURLOPT_TLSAUTH_USERNAME(3)\fP and \fICURLOPT_TLSAUTH_PASSWORD(3)\fP

options.

.SH DEFAULT

CURL_TLSAUTH_NONE (0)

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.SH PROTOCOLS

All TLS-based protocols

.SH EXAMPLE