Advice user to set up stripping trailing white space in editor

Test Plan: Triggered it.

Reviewers: epriestley

Reviewed By: epriestley

CC: aran, Korvin

Maniphest Tasks: T2022

Differential Revision: https://secure.phabricator.com/D3864

src/lint/linter/ArcanistTextLinter.php

@@ -197,7 +197,9 @@ final class ArcanistTextLinter extends ArcanistLinter {
       $this->raiseLintAtOffset(
         $offset,
         self::LINT_TRAILING_WHITESPACE,
-        'This line contains trailing whitespace.',
+        'This line contains trailing whitespace. Consider setting up your '.
+          'editor to automatically remove trailing whitespace, you will save '.
+          'time.',
         $string,
         '');
     }