docs: fix comments

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---

Author: kgryte

lib/node_modules/@stdlib/fft/base/fftpack/lib/radb2.js

@@ -163,10 +163,10 @@ function radb2( M, L, cc, oc, out, oo, twiddles, ot ) { // FIXME: support stride
 	var it2;
 	var io;
 	var ic;
-	var sc = 1;
-	var so = 1;
+	var sc = 1; // FIXME: make a parameter
+	var so = 1; // FIXME: make a parameter
 	var i;
-	var k; // FIXME: make a parameter
+	var k;
 
 	/*
 	* Perform the core butterfly for each sub-sequence being transformed.