Add some missing headers to doc.config.

Change-Id: I9d9c055c6cd2c51183f704d61aea6ccbfc218629
Reviewed-on: https://boringssl-review.googlesource.com/4294
Reviewed-by: Adam Langley <agl@google.com>

include/openssl/rand.h

@@ -22,6 +22,9 @@ extern "C" {
 #endif
 
 
+/* Random number generation. */
+
+
 /* RAND_bytes writes |len| bytes of random data to |buf|. It returns one on
  * success and zero on otherwise. */
 OPENSSL_EXPORT int RAND_bytes(uint8_t *buf, size_t len);

util/doc.config

@@ -9,10 +9,12 @@
       "include/openssl/bytestring.h",
       "include/openssl/err.h",
       "include/openssl/cpu.h",
+      "include/openssl/crypto.h",
       "include/openssl/ex_data.h",
       "include/openssl/lhash.h",
       "include/openssl/mem.h",
       "include/openssl/obj.h",
+      "include/openssl/rand.h",
       "include/openssl/stack.h",
       "include/openssl/thread.h",
       "include/openssl/time_support.h"