fix: fixing mistakes

Co-authored-by: Neeraj Pathak <[email protected]>
Signed-off-by: Dhruv/ <[email protected]>

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

@@ -247,6 +247,9 @@ 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:
+    const int N = 4;
+
     // Compute the arithmetic mean:
     double v = stdlib_strided_dmeanpn( 4, x, 2 );