docs(select): update select styleguide with dropdown width information

packages/documentation/docs/controls/_select_styleguide.md

@@ -42,7 +42,7 @@ A select component allows users to choose from a list of options. It supports si
 - **Overflow:**
   - The text in an input field is truncated with the length of the container.
   - On the multiselect, the selected items break into a second line and then show a scrollbar if it extends beyond two lines.
-  - The dropdown list is scrollable when the list exceeds the container height. Its width is defined by the longest item.
+  - The dropdown list is scrollable when the list exceeds the container height. Its width is defined by the longest item. The maximum width of the dropdown is set to 100% by default. Both the width and maximum width of the dropdown can be defined in rem.
 - **Alignment:** Selects are always aligned to the left, while right alignment is reserved exclusively for [number inputs](input-number.mdx).
 
 ### States