update docs

docs/components/select.md

@@ -396,7 +396,7 @@ const App = () => (
 
 ### Placement
 
-The preferred placement of the dropdown can be set with the `placement` attribute. Note that the actual position may vary to ensure the panel remains in the viewport.
+The preferred placement of the select's menu can be set with the `placement` attribute. Note that the actual position may vary to ensure the panel remains in the viewport. Valid placements are `top` and `bottom`.
 
 ```html preview
 <sl-select placement="top">

src/components/select/select.ts

@@ -122,7 +122,7 @@ export default class SlSelect extends LitElement {
   @property() label = '';
 
   /**
-   * The preferred placement of the dropdown panel. Note that the actual placement may vary as needed to keep the panel
+   * The preferred placement of the select's menu. Note that the actual placement may vary as needed to keep the panel
    * inside of the viewport.
    */
   @property() placement: 'top' | 'bottom' = 'bottom';