test: add comment on the use of approximate equality

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---

Author: anandkaranubc

lib/node_modules/@stdlib/math/base/special/factorial2f/test/test.js

@@ -91,6 +91,8 @@ tape( 'the function evaluates the double factorial', function test( t ) {
 			t.strictEqual( v, expected[ i ], 'returns expected value' );
 		} else {
 			delta = absf( v - expected[i] );
+
+			// NOTE: We use approximate equality because expected values from SciPy are computed using gamma function approximations instead of iterative single-precision computation.
 			tol = 2.4 * EPS * absf( expected[i] );
 			t.ok( delta <= tol, 'within tolerance. x: '+x[i]+'. v: '+v+'. e: '+expected[i]+'. Δ: '+delta+'. tol: '+tol+'.' );
 		}

lib/node_modules/@stdlib/math/base/special/factorial2f/test/test.native.js

@@ -81,6 +81,8 @@ tape( 'the function evaluates the double factorial', opts, function test( t ) {
 			t.strictEqual( v, expected[ i ], 'returns expected value' );
 		} else {
 			delta = absf( v - expected[i] );
+
+			// NOTE: We use approximate equality because expected values from SciPy are computed using gamma function approximations instead of iterative single-precision computation.
 			tol = 2.4 * EPS * absf( expected[i] );
 			t.ok( delta <= tol, 'within tolerance. x: '+x[i]+'. v: '+v+'. e: '+expected[i]+'. Δ: '+delta+'. tol: '+tol+'.' );
 		}