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/dsa.c b/apps/dsa.c
index 1c841a3..b7b9593 100644
--- a/apps/dsa.c
+++ b/apps/dsa.c
@@ -90,8 +90,8 @@
     {"noout", OPT_NOOUT, '-', "Don't print key out"},
     {"text", OPT_TEXT, '-', "Print the key in text"},
     {"modulus", OPT_MODULUS, '-', "Print the DSA public value"},
-    {"pubin", OPT_PUBIN, '-'},
-    {"pubout", OPT_PUBOUT, '-'},
+    {"pubin", OPT_PUBIN, '-', "Expect a public key in input file"},
+    {"pubout", OPT_PUBOUT, '-', "Output public key, not private"},
     {"passin", OPT_PASSIN, 's', "Input file pass phrase source"},
     {"passout", OPT_PASSOUT, 's', "Output file pass phrase source"},
     {"", OPT_CIPHER, '-', "Any supported cipher"},