docs: fix signature

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Author: kgryte

lib/node_modules/@stdlib/random/tools/unary/README.md

@@ -40,7 +40,7 @@ limitations under the License.
 var Random = require( '@stdlib/random/tools/unary' );
 ```
 
-#### Random( prng, idtypes odtypes, policies\[, options] )
+#### Random( prng, idtypes, odtypes, policies\[, options] )
 
 Returns an interface for creating ndarrays filled with pseudorandom values drawn from a unary PRNG.