docs: fix description

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Author: kgryte

lib/node_modules/@stdlib/stats/base/ztest/one-sample/results/factory/README.md

@@ -42,7 +42,7 @@ var resultsFactory = require( '@stdlib/stats/base/ztest/one-sample/results/facto
 
 #### resultsFactory( dtype )
 
-Returns a new constructor for creating a one-sample Z-test results object..
+Returns a new constructor for creating a one-sample Z-test results object.
 
 ```javascript
 var Results = resultsFactory( 'float64' );