Fix various typos, update SMIMECapabilities description.

doc/crypto/CMS_sign_add1_signer.pod

@@ -8,7 +8,7 @@ CMS_sign_add_signer, CMS_SignerInfo_sign - add a signer to a CMS_ContentInfo sig
 
  #include <openssl/cms.h>
 
- CMS_SignerInfo *CMS_sign_add1_signer(CMS_ContentInfo *cms, X509 *signcert, EVP_PKEY *pkey, const EVP_MD *md, int flags);
+ CMS_SignerInfo *CMS_sign_add1_signer(CMS_ContentInfo *cms, X509 *signcert, EVP_PKEY *pkey, const EVP_MD *md, unsigned int flags);
 
 int CMS_SignerInfo_sign(CMS_SignerInfo *si);
 
@@ -36,9 +36,9 @@ are both set.
 
 =head1 NOTES
 
-The main purpose of this function is to provide finer control over a CMS
-signed data structure where the simpler CMS_sign() function defaults are
-not appropriate. For example if multiple signers or non default digest
+The main purpose of this CMS_sign_add1_signer() is to provide finer control
+over a CMS signed data structure where the simpler CMS_sign() function defaults
+are not appropriate. For example if multiple signers or non default digest
 algorithms are needed. New attributes can also be added using the returned
 CMS_SignerInfo struture and the CMS attribute utility functions.
 
@@ -52,8 +52,8 @@ The returned CMS_ContentInfo structure will be valid and finalized when this
 flag is set.
 
 If B<CMS_PARTIAL> is set in addition to B<CMS_REUSE_DIGEST> then the 
-B<CMS_SIGNER_INO> structure will not be finalized so additional attributes
-can be added. In this case an explicit call to CMS_SignerInfo_Sign() is
+CMS_SignerInfo structure will not be finalized so additional attributes
+can be added. In this case an explicit call to CMS_SignerInfo_sign() is
 needed to finalize it.
 
 If B<CMS_NOCERTS> is set the signer's certificate will not be included in the
@@ -74,10 +74,12 @@ identifier value instead. An error occurs if the signing certificate does not
 have a subject key identifier extension.
 
 If present the SMIMECapabilities attribute indicates support for the following
-algorithms: triple DES, 128 bit RC2, 64 bit RC2, DES and 40 bit RC2. If any of
-these algorithms is disabled then it will not be included.
+algorithms in preference order: 256 bit AES, Gost R3411-94, Gost 28147-89, 192
+bit AES, 128 bit AES, triple DES, 128 bit RC2, 64 bit RC2, DES and 40 bit RC2.
+If any of these algorithms is not available then it will not be included: for example the GOST algorithms will not be included if the GOST ENGINE is
+not loaded.
 
-CMS_sign_add_signers() returns an internal pointer to the CMS_SIGNER_INFO
+CMS_sign_add1_signer() returns an internal pointer to the CMS_SignerInfo
 structure just added, this can be used to set additional attributes 
 before it is finalized.