GH932: Add more help messages to some apps options.

Reviewed-by: Matt Caswell <matt@openssl.org>
Reviewed-by: Rich Salz <rsalz@openssl.org>
diff --git a/apps/cms.c b/apps/cms.c
index 95f2124..7bc40d5 100644
--- a/apps/cms.c
+++ b/apps/cms.c
@@ -142,7 +142,7 @@
     {"encrypt", OPT_ENCRYPT, '-', "Encrypt message"},
     {"decrypt", OPT_DECRYPT, '-', "Decrypt encrypted message"},
     {"sign", OPT_SIGN, '-', "Sign message"},
-    {"sign_receipt", OPT_SIGN_RECEIPT, '-'},
+    {"sign_receipt", OPT_SIGN_RECEIPT, '-', "Generate a signed receipt for the message"},
     {"resign", OPT_RESIGN, '-'},
     {"verify", OPT_VERIFY, '-', "Verify signed message"},
     {"verify_retcode", OPT_VERIFY_RETCODE, '-'},
@@ -177,7 +177,7 @@
     {"noindef", OPT_NOINDEF, '-'},
     {"nooldmime", OPT_NOOLDMIME, '-'},
     {"crlfeol", OPT_CRLFEOL, '-'},
-    {"noout", OPT_NOOUT, '-'},
+    {"noout", OPT_NOOUT, '-', "For the -cmsout operation do not output the parsed CMS structure"},
     {"receipt_request_print", OPT_RR_PRINT, '-'},
     {"receipt_request_all", OPT_RR_ALL, '-'},
     {"receipt_request_first", OPT_RR_FIRST, '-'},
@@ -191,7 +191,7 @@
      "Do not load certificates from the default certificates directory"},
     {"content", OPT_CONTENT, '<',
      "Supply or override content for detached signature"},
-    {"print", OPT_PRINT, '-'},
+    {"print", OPT_PRINT, '-', "For the -cmsout operation print out all fields of the CMS structure"},
     {"secretkey", OPT_SECRETKEY, 's'},
     {"secretkeyid", OPT_SECRETKEYID, 's'},
     {"pwri_password", OPT_PWRI_PASSWORD, 's'},
@@ -205,7 +205,7 @@
     {"signer", OPT_SIGNER, 's', "Signer certificate file"},
     {"recip", OPT_RECIP, '<', "Recipient cert file for decryption"},
     {"certsout", OPT_CERTSOUT, '>', "Certificate output file"},
-    {"md", OPT_MD, 's'},
+    {"md", OPT_MD, 's', "Digest algorithm to use when signing or resigning"},
     {"inkey", OPT_INKEY, 's',
      "Input private key (if not signer or recipient)"},
     {"keyform", OPT_KEYFORM, 'f', "Input private key format (PEM or ENGINE)"},