docs: fix missing include

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Author: kgryte

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

@@ -231,6 +231,8 @@ double stdlib_strided_dnanmskrange( const CBLAS_INT N, const double *X, const CB
 Computes the [range][range] of a double-precision floating-point strided array according to a `mask`, ignoring `NaN` values and using alternative indexing semantics.
 
 ```c
+#include <stdint.h>
+
 const double x[] = { 1.0, -2.0, 4.0, 2.0, 0.0/0.0 };
 const uint8_t mask[] = { 0, 0, 1, 0, 0 };