Add reminder of serialization to Grid documentation (#11037)

documentation/components/components-grid.asciidoc

@@ -533,18 +533,19 @@ Formats a column with the [classname]#LocalDate# type.
 The renderer can be constructed with a [classname]#DateTimeFormatter#, or with a custom pattern string.
 The locale is either given explicitly with the pattern, resolved from the given [classname]#DateTimeFormatter# or from the grid the renderer is attached to, if neither of the previous are given.
 For the pattern string syntax, refer to the following documentation: link:https://docs.oracle.com/javase/8/docs/api/java/time/format/DateTimeFormatter.html#patterns[docs.oracle.com/javase/8/docs/api/java/time/format/DateTimeFormatter.html#patterns].
-
+Note we should use `SerializableProvider<DateTimeFormatter>` or lambda in the first case, because
+`DateTimeFormatter` is not serializable, and that may lead to problems in certain cases, for instance in a cluster environment.
 +
 [source, java]
 ----
-DateTimeFormatter formatter = DateTimeFormatter
+LocalDateRenderer renderer = new LocalDateRenderer(() -> DateTimeFormatter
         .ofLocalizedDate(FormatStyle.LONG)
-        .withLocale(Locale.ENGLISH);
+        .withLocale(Locale.ENGLISH));
 
 Column<Person, LocalDate> bornColumn =
         grid.addColumn(
           Person::getBirthDate,
-          new LocalDateRenderer(formatter));
+          renderer);
 
 // Alternatively, with a custom pattern:
 Column<Person, LocalDate> bornColumn =
@@ -559,14 +560,14 @@ Otherwise the same as [classname]#LocalDateRenderer#, except for the [classname]
 +
 [source, java]
 ----
-DateTimeFormatter formatter = DateTimeFormatter
-        .ofLocalizedDate(FormatStyle.LONG, FormatStyle.SHORT)
-        .withLocale(Locale.ENGLISH);
+LocalDateTimeRenderer renderer = new LocalDateTimeRenderer(
+        () -> DateTimeFormatter
+            .ofLocalizedDateTime(FormatStyle.LONG, FormatStyle.SHORT)
+            .withLocale(Locale.ENGLISH));
 
 Column<Person, LocalDateTime> bornColumn =
-        grid.addColumn(
-          Person::getBirthDateAndTime,
-          new LocalDateTimeRenderer(formatter));
+        grid.addColumn(Person::getBirthDateAndTime, renderer);
+
 
 // Alternatively, with a custom pattern:
 Column<Person, LocalDateTime> bornColumn =