docs: update example to remove variable declaration

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Author: gururaj1512

lib/node_modules/@stdlib/stats/base/nanstdevyc/docs/repl.txt

@@ -108,7 +108,7 @@
     ~2.0817
 
     // Using offset parameter:
-    > var x = [ 1.0, -2.0, 3.0, 2.0, 5.0, -1.0, NaN, NaN ];
+    > x = [ 1.0, -2.0, 3.0, 2.0, 5.0, -1.0, NaN, NaN ];
     > {{alias}}.ndarray( 4, 1, x, 2, 1 )
     ~2.0817