docs: fix missing period

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Author: kgryte

lib/node_modules/@stdlib/stats/base/ztest/one-sample/results/to-string/docs/types/index.d.ts

@@ -53,7 +53,7 @@ interface Results {
 	ci: Float64Array | Float32Array;
 
 	/**
-	* Value of the mean under the null hypothesis
+	* Value of the mean under the null hypothesis.
 	*/
 	nullValue: number;