Fix markup to be compatible with Sphinx and add rough API doc
diff --git a/OpenSSL/crypto/netscape_spki.c b/OpenSSL/crypto/netscape_spki.c
index d6103ca..8110a24 100644
--- a/OpenSSL/crypto/netscape_spki.c
+++ b/OpenSSL/crypto/netscape_spki.c
@@ -39,7 +39,7 @@
 NetscapeSPKI([enc]) -> NetscapeSPKI instance\n\
 \n\
 :param enc: Base64 encoded NetscapeSPKI object.\n\
-:type enc: C{str}\n\
+:type enc: :py:data:`str`\n\
 :return: The NetscapeSPKI object\n\
 ";