fix: Update README.md

Signed-off-by: Dhruv/ <[email protected]>

Author: DhruvArvindSingh

lib/node_modules/@stdlib/stats/base/dmeanpn/README.md

@@ -247,7 +247,7 @@ int main( void ) {
     // Create a strided array:
     const double x[] = { 1.0, 2.0, 3.0, 4.0, 5.0, 6.0, 7.0, 8.0 };
 
-// Specify the number of elements:
+    // Specify the number of elements:
     const int N = 4;
 
     // Compute the arithmetic mean: