chore: update retrun values

Author: Neerajpathak07

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

@@ -190,7 +190,7 @@ Computes the arithmetic mean of a single-precision floating-point strided array,
 const float x[] = { 1.0f, 2.0f, 0.0f/0.0f, 3.0f, 0.0f/0.0f, 4.0f, 5.0f, 6.0f, 0.0f/0.0f, 7.0f, 8.0f, 0.0f/0.0f };
 
 double v = stdlib_strided_dsnanmeanwd( 6, x, 2 );
-// returns 4.66
+// returns 4.6667
 ```
 
 The function accepts the following arguments:
@@ -211,7 +211,7 @@ Computes the arithmetic mean of a single-precision floating-point strided array,
 const float x[] = { 1.0f, 2.0f, 0.0f/0.0f, 3.0f, 0.0f/0.0f, 4.0f, 5.0f, 6.0f, 0.0f/0.0f, 7.0f, 8.0f, 0.0f/0.0f };
 
 double v = stdlib_strided_dsnanmeanwd_ndarray( 6, x, 2, 0 );
-// returns 4.66
+// returns 4.6667
 ```
 
 The function accepts the following arguments: