docs(picker): fixed typo

Co-authored-by: Casey Eickhoff <48574582+caseyisonit@users.noreply.github.com>

Author: nikkimk

packages/picker/README.md

@@ -32,7 +32,7 @@ import { Picker } from '@spectrum-web-components/picker';
 
 ### Anatomy
 
-A picker includes a label and a menu..
+A picker includes a label and a menu.
 
 #### Labels