fix(SelectMenu): fixes non-strings and nested searchable attributes (#967)

Co-authored-by: Benjamin Canac <canacb1@gmail.com>

docs/content/3.forms/4.select-menu.md

@@ -99,6 +99,20 @@ props:
 ---
 ::
 
+#### Search Attributes
+
+Use the `search-attributes` with an array of property names to search on each option object.
+
+Nested attributes can be accessed using `dot.notation`. When the property value is an array or object, these are cast to string so these can be searched within.
+
+::component-example
+---
+component: 'select-menu-example-search-attributes'
+componentProps:
+  class: 'w-full lg:w-96'
+---
+::
+
 #### Clear on close :u-badge{label="New" class="align-middle ml-2 !rounded-full" variant="subtle"}
 
 By default, the search query will be kept after the menu is closed. To clear it on close, set the `clear-search-on-close` prop.