docs: fix comment

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---

Author: kgryte

lib/node_modules/@stdlib/math/base/special/cpolarf/docs/types/test.ts

@@ -52,7 +52,7 @@ import cpolarf = require( './index' );
 	cpolarf.assign<number>( new Complex64( 5.0, 3.0 ), out, 1, 0 ); // $ExpectType Collection<number>
 }
 
-// The compiler throws an error if the `assign` method is provided a first argument which is not a number...
+// The compiler throws an error if the `assign` method is provided a first argument which is not a complex number...
 {
 	const out = [ 0.0, 0.0 ];