Convert nng_random to new format.

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diff --git a/docs/ref/api/util/nng_random.md b/docs/ref/api/util/nng_random.md
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+# nng_random
+
+## NAME
+
+nng_random --- get random number
+
+## SYNOPSIS
+
+```c
+#include <nng/nng.h>
+
+uint32_t nng_random(void);
+```
+
+## DESCRIPTION
+
+The `nng_random` returns a random number.
+The value returned is suitable for use with cryptographic functions such as
+key generation.
+The value is obtained using platform-specific cryptographically strong random
+number facilities when available.
+
+## RETURN VALUES
+
+Returns a random 32-bit value.