Fix markup to be compatible with Sphinx and add rough API doc
diff --git a/OpenSSL/crypto/crypto.c b/OpenSSL/crypto/crypto.c
index 421eabc..1442b5a 100644
--- a/OpenSSL/crypto/crypto.c
+++ b/OpenSSL/crypto/crypto.c
@@ -141,11 +141,11 @@
:param pkey: The PKey to dump\n\
:param cipher: (optional) if encrypted PEM format, the cipher to\n\
use\n\
-:param passphrase - (optional) if encrypted PEM format, this can be either\n\
- the passphrase to use, or a callback for providing the\n\
- passphrase.\n\
+:param passphrase: (optional) if encrypted PEM format, this can be either\n\
+ the passphrase to use, or a callback for providing the\n\
+ passphrase.\n\
:return: The buffer with the dumped key in\n\
-:rtype: C{str}\n\
+:rtype: :py:data:`str`\n\
";
static PyObject *