[Feedback] Update strings per UX recommendations.

chrome/browser/resources/feedback/css/feedback.css

 /* Copyright 2013 The Chromium Authors. All rights reserved.
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file. */
 
 
 html {
   height: 100%;
 }
 
 body {
@@ skipping 38 matching lines @@
 .content #description-text {
   border-color: #c8c8c8;
   box-sizing: border-box;
   height: 120px;
   line-height: 18px;
   padding: 10px;
   resize: none;
   width: 100%;
 }
 
+.content #additional-info-label {
+  -webkit-margin-start: 10px;
+}
+
 .content .text-field-container {
   -webkit-align-items: center;
   -webkit-padding-start: 10px;
   display: -webkit-flex;
   height: 29px;
   margin-top: 10px;
 }
 
 .content .text-field-container > label {
   -webkit-flex: 0 1 auto;
@@ skipping 119 matching lines @@
   height: 50px;
   margin-bottom: 20px;
   margin-top: 120px;
 }
 
 .srt-body {
   font-size: 14px;
   line-height: 24px;
   margin: 0 40px;
 }