Change "Contains Text" label to "Contains Words"

Summary: Fixes T4818. Clarify that this does not search for arbitrary text substrings.

Test Plan: `grep`

Reviewers: btrahan, chad

Reviewed By: chad

Subscribers: epriestley

Maniphest Tasks: T4818

Differential Revision: https://secure.phabricator.com/D9278

Author: epriestley

src/applications/maniphest/query/ManiphestTaskSearchEngine.php

@@ -388,7 +388,7 @@ public function buildSearchForm(
       ->appendChild(
         id(new AphrontFormTextControl())
           ->setName('fulltext')
-          ->setLabel(pht('Contains Text'))
+          ->setLabel(pht('Contains Words'))
           ->setValue($saved->getParameter('fulltext')))
       ->appendChild(
         id(new AphrontFormTextControl())