chore: improve benchmark.js and main.c

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Author: saurabhraghuvanshii

lib/node_modules/@stdlib/stats/base/dists/poisson/logpmf/benchmark/benchmark.js

@@ -69,7 +69,8 @@ bench( pkg+':factory', function benchmark( b ) {
 	var y;
 	var i;
 
-	lambda = 100;
+	len = 100;
+	lambda = 10.0;
 	mypmf = logpmf.factory( lambda );
 	x = new Float64Array( len );
 

lib/node_modules/@stdlib/stats/base/dists/poisson/logpmf/src/main.c

@@ -28,8 +28,8 @@
 /**
 * Evaluates the quantile function for a Poisson distribution with mean parameter `lambda`.
 *
-* @param x		 input value
-* @param lambda	mean parameter
+* @param x		  input value
+* @param lambda	  mean parameter
 * @return		  evaluated logPMF
 *
 * @example