docs: fix include path

Signed-off-by: Athan <[email protected]>

Author: kgryte

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

@@ -168,7 +168,7 @@ console.log( v );
 ### Usage
 
 ```c
-#include "stdlib/stats/base/dnanmax.h"
+#include "stdlib/stats/base/dsmean.h"
 ```
 
 #### stdlib_strided_dsmean( N, \*X, strideX )