Clarify semantics of Name::toString()

Author: morozov

src/Schema/Name.php

@@ -12,8 +12,7 @@ interface Name
     /**
      * Returns the string representation of the name.
      *
-     * The consumers of this method should not rely on a specific return value. It should be used only for diagnostic
-     * purposes.
+     * If passed to the corresponding parser, the name should be parsed back to an equivalent object.
      */
     public function toString(): string;
 }