update dropdowns

Author: ethanpalm

navigation.mdx

@@ -266,7 +266,7 @@ Anchors in a `global` object must have an `href` field and cannot direct to a re
 
 ## Dropdowns
 
-Dropdowns show up in the same place as anchors, but are consolidated into a single dropdown.
+Dropdowns are contained in an expandable menu at the top of your sidebar navigation. Each item in a dropdown directs to a section of your documentation.
 
 <img
   className="block dark:hidden pointer-events-none"
@@ -278,7 +278,7 @@ Dropdowns show up in the same place as anchors, but are consolidated into a sing
   src="/images/navigation/dropdowns-dark.png"
 />
 
-While not required, we also recommend that you set an icon for each dropdown item.
+In the `navigation` object, `dropdowns` is an array where each entry is an object that requires a `dropdown` field and can contain other navigation fields such as groups, pages, icons, or links to external pages.
 
 ```json
 {