docs: fix description

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---

Author: kgryte

lib/node_modules/@stdlib/stats/strided/sztest2/docs/types/index.d.ts

@@ -87,7 +87,7 @@ interface BaseResults {
 	ci: Float32Array;
 
 	/**
-	* Value of the mean under the null hypothesis.
+	* Difference in means under the null hypothesis.
 	*/
 	nullValue: number;