Apply suggestions from code review

Co-authored-by: Livia Medeiros <[email protected]>

Author: aduh95

test/parallel/test-http-set-trailers.js

@@ -43,6 +43,7 @@ function testHttp10(port, callback) {
 
   c.on('end', common.mustCall(() => {
     c.end();
+    // Ensure no trailer being in HTTP/1.0 response
     assert.doesNotMatch(
       res_buffer,
       /x-foo/,
@@ -68,6 +69,7 @@ function testHttp11(port, callback) {
     res_buffer += chunk;
     if (/0\r\n/.test(res_buffer)) { // got the end.
       clearTimeout(tid);
+      // Ensure trailer being in HTTP/1.1 response
       assert.match(
         res_buffer,
         /0\r\nx-foo: bar\r\n\r\n$/,