docs: update examples

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---

Author: gunjjoshi

lib/node_modules/@stdlib/fft/base/fftpack/rffti/examples/index.js

@@ -21,26 +21,21 @@
 var Float64Array = require( '@stdlib/array/float64' );
 var rffti = require( './../lib' );
 
-var workspace;
-var N;
-var nf;
-var i;
-var j;
-
-N = 8;
-workspace = new Float64Array( ( 2*N ) + 34 );
+var N = 8;
+var workspace = new Float64Array( ( 2*N ) + 34 );
 
 rffti( N, workspace, 1, 0 );
 
 console.log( 'Sequence length: %d', N );
 console.log( 'Twiddle factors:' );
+var i;
 for ( i = N; i < 2*N; i++ ) {
 	console.log( '  workspace[%d] = %d', i, workspace[ i ] );
 }
 
 console.log( 'Factorization:' );
-nf = workspace[ ( 2*N ) + 1 ];
+var nf = workspace[ ( 2*N ) + 1 ];
 console.log( '  number of factors: %d', nf );
-for ( j = 0; j < nf; j++ ) {
-	console.log( '  factor[%d]: %d', j, workspace[ ( 2*N ) + 2 + j ] );
+for ( i = 0; i < nf; i++ ) {
+	console.log( '  factor[%d]: %d', i, workspace[ ( 2*N ) + 2 + i ] );
 }