docs: update libssh2_hostkey_hash.3 [ci skip]
@@ -11,12 +11,12 @@ libssh2_hostkey_hash(LIBSSH2_SESSION *session, int hash_type);
\fIsession\fP - Session instance as returned by
.BR libssh2_session_init_ex(3)
-\fIhash_type\fP - One of: \fBLIBSSH2_HOSTKEY_HASH_MD5\fP or
-\fBLIBSSH2_HOSTKEY_HASH_SHA1\fP.
+\fIhash_type\fP - One of: \fBLIBSSH2_HOSTKEY_HASH_MD5\fP,
+\fBLIBSSH2_HOSTKEY_HASH_SHA1\fP or \fBLIBSSH2_HOSTKEY_HASH_SHA256\fP.
Returns the computed digest of the remote system's hostkey. The length of
the returned string is hash_type specific (e.g. 16 bytes for MD5,
-20 bytes for SHA1).
+20 bytes for SHA1, 32 bytes for SHA256).
.SH RETURN VALUE
Computed hostkey hash value, or NULL if the information is not available
(either the session has not yet been started up, or the requested hash
