Password manager internals page: Rephrase the page explanation

This replaces the explanation/headline of chrome://password-manager-internals
with a text suggestion from the UX team.

BUG=347927

Review URL: https://codereview.chromium.org/323043003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@276338 0039d316-1c4b-4281-b951-d872f2087c98

chrome/browser/resources/password_manager_internals/password_manager_internals.html

@@ -11,11 +11,7 @@
 </body>
 <h1>Password Manager Internals</h1>
 <div id="logging-note">
-  <i>
-    Showing password manager logs since opening a password-manager-internals
-    page. Close all password-manager-internals pages to stop logging and to
-    permanently delete existing entries.
-  </i>
+  <i>Captured password manager logs are listed below. Logs are cleared and no longer captured when all password-manager-internals pages are closed.</i>
 </div>
 <div id="log-entries">
 </div>