PHP/POSIXFunctions: update code comment for namespaced function calls tests

Author: rodrigoprimo

WordPress/Tests/PHP/POSIXFunctionsUnitTest.inc

@@ -26,7 +26,7 @@ $title_parts = spliti( ' ', get_the_title(), 4 ); // Bad, spliti also deprecated
 sql_regcase( 'Foo - bar.'); // Bad. Deprecated.
 
 /*
- * Safeguard support for PHP 8.0+ tokenization of namespaced "names".
+ * Safeguard correct handling of all types of namespaced function calls
  */
 \split( ':', $date );
 MyNamespace\split( ':', $date );