Adjust version comments.

util/optimize.php

@@ -2,7 +2,7 @@
 /**
  * Command-line tool to optimize the Solr index.
  *
- * PHP version 5
+ * PHP version 7
  *
  * Copyright (C) Villanova University 2009.
  *

util/sitemap.php

@@ -2,7 +2,7 @@
 /**
  * Command-line tool to generate sitemaps based on Solr index contents.
  *
- * PHP version 5
+ * PHP version 7
  *
  * Copyright (C) Villanova University 2009.
  *

util/suppressed.php

@@ -2,7 +2,7 @@
 /**
  * Command-line tool to delete suppressed records from the index.
  *
- * PHP version 5
+ * PHP version 7
  *
  * Copyright (C) Villanova University 2007.
  *