Add the versionadded directive

Author: javiereguiluz

components/console/helpers/formatterhelper.rst

@@ -136,6 +136,10 @@ precision (default ``1``) of the result::
     Helper::formatTime(172799, 4);     // 1 d, 23 h, 59 min, 59 s
     Helper::formatTime(172799.056, 5); // 1 d, 23 h, 59 min, 59 s, 56 ms
 
+.. versionadded:: 7.3
+
+    Support for formatting up to milliseconds was introduced in Symfony 7.3.
+
 Formatting Memory
 -----------------