doc: Fix typo in EVP_DigestSignInit manpage
CLA: trivial
@@ -128,7 +128,7 @@ EVP_DigestSignFinal().
=head1 RETURN VALUES
-EVP_DigestSignInit(), EVP_DigestSignUpdate(), EVP_DigestSignaFinal() and
+EVP_DigestSignInit(), EVP_DigestSignUpdate(), EVP_DigestSignFinal() and
EVP_DigestSign() return 1 for success and 0 for failure.
The error codes can be obtained from L<ERR_get_error(3)>.
