docs: fix examples

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---

Author: anandkaranubc

lib/node_modules/@stdlib/constants/float64/max-safe-nth-factorial/README.md

@@ -69,6 +69,8 @@ function factorial( n ) {
     return a;
 }
 
+var v;
+var i;
 for ( i = 0; i < 50; i++ ) {
     v = factorial( i );
     if ( i > FLOAT64_MAX_SAFE_NTH_FACTORIAL ) {

lib/node_modules/@stdlib/constants/float64/max-safe-nth-factorial/examples/index.js

@@ -20,9 +20,6 @@
 
 var FLOAT64_MAX_SAFE_NTH_FACTORIAL = require( './../lib' ); // eslint-disable-line id-length
 
-var v;
-var i;
-
 function factorial( n ) {
 	var a;
 	var i;
@@ -34,6 +31,8 @@ function factorial( n ) {
 	return a;
 }
 
+var v;
+var i;
 for ( i = 0; i < 50; i++ ) {
 	v = factorial( i );
 	if ( i > FLOAT64_MAX_SAFE_NTH_FACTORIAL ) {