docs: update descriptions

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

Author: kgryte

lib/node_modules/@stdlib/stats/base/ndarray/sztest2/docs/repl.txt

@@ -16,9 +16,9 @@
         - a zero-dimensional ndarray specifying the difference in means under
         the null hypothesis.
         - a zero-dimensional ndarray specifying the known standard deviation of
-        first one-dimensional input ndarray.
+        the first one-dimensional input ndarray.
         - a zero-dimensional ndarray specifying the known standard deviation of
-        second one-dimensional input ndarray.
+        the second one-dimensional input ndarray.
 
     Returns
     -------