docs: avoid duplicate declaration

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

Author: kgryte

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

@@ -109,7 +109,7 @@
     ~4.3333
 
     // 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 )
     ~4.3333