replace test comments with refs

Author: duncpro

test/parallel/test-buffer-concat.js

@@ -100,8 +100,7 @@ assert.deepStrictEqual(Buffer.concat([new Uint8Array([0x41, 0x42]),
                                       new Uint8Array([0x43, 0x44])]),
                        Buffer.from('ABCD'));
 
-// Test its possible to concat buffers where the total length of the result in bytes
-// is greater than 2^32.
+// Ref: https://github.com/nodejs/node/issues/55422#issue-2594486812
 if (2 ** 32 + 1 <= kMaxLength) {
   const a = Buffer.alloc(2 ** 31, 0);
   const b = Buffer.alloc(2 ** 31, 1);