docs: update examples to use dynamic length for input arrays

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Author: gururaj1512

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

@@ -33,7 +33,7 @@
     --------
     // Standard Usage:
     > var x = [ 1.0, -2.0, NaN, 2.0 ];
-    > {{alias}}( 4, x, 1 )
+    > {{alias}}( x.length, x, 1 )
     ~0.3333
 
     // Using `N` and stride parameters:
@@ -79,11 +79,11 @@
     --------
     // Standard Usage:
     > var x =[ 1.0, -2.0, NaN, 2.0 ];
-    > {{alias}}.ndarray( 4, x, 1, 0 )
+    > {{alias}}.ndarray( x.length, x, 1, 0 )
     ~0.3333
 
     // 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, x, 2, 1 )
     ~-0.3333