docs: document defaultOpen property for Accordion component

fern/products/docs/pages/component-library/default-components/accordion-groups.mdx

@@ -7,12 +7,12 @@ Accordion Groups allow you to organize content into collapsible sections, making
 
 <AccordionGroup>
   <Accordion title="Basic usage">
-    Accordion Groups can contain multiple Accordion items. Each item has a title and content that can be expanded or collapsed.
+    Accordion Groups can contain multiple Accordion items. Each item has a title and content that can be expanded or collapsed. You can use the `defaultOpen` prop to expand specific accordions by default when the page loads.
 
     ```jsx
     <AccordionGroup>
-      <Accordion title="Section 1">
-        Content for section 1
+      <Accordion title="Section 1" defaultOpen={true}>
+        Content for section 1, expanded by default
       </Accordion>
       <Accordion title="Section 2">
         Content for section 2
@@ -34,10 +34,6 @@ Accordion Groups allow you to organize content into collapsible sections, making
 
 The recent update to our Accordion component improves content discoverability by allowing users to search through all content, including collapsed sections, using the browser's search function (Cmd+F / Ctrl+F).
 
-### Usage examples
-
-Here are some examples of how to use the Accordion Group component:
-
 <Tabs>
 <Tab title="Example">
   <AccordionGroup>

fern/products/docs/pages/component-library/default-components/accordions.mdx

@@ -6,16 +6,23 @@ description: 'Expand or collapse to reveal more information'
 The Accordion component allows you to create expandable sections in your documentation. Content within accordions is searchable using browser search (cmd+f) even when collapsed. The component is optimized for SEO with server-side HTML generation, ensuring search engines can properly index all content within accordions.
 
 <Tabs>
-  <Tab title="Example">
+  <Tab title="Examples">
       <Accordion title='Single Accordion'>
         This is an example of an accordion component. When clicked, it expands to reveal this additional content. 
       </Accordion>
+      <Accordion title='Accordion open by default' defaultOpen={true}>
+      You can use the `defaultOpen` property to have specific accordions expanded by default when the page loads. This is useful for highlighting important information or frequently accessed content.
+    </Accordion>
   </Tab>
   <Tab title="Markdown">
     ```jsx
     <Accordion title='Single Accordion'>
       This is an example of an accordion component. When clicked, it expands to reveal this additional content.
     </Accordion>
+
+    <Accordion title='Accordion open by default' defaultOpen={true}>
+      You can use the `defaultOpen` property to have specific accordions expanded by default when the page loads. This is useful for highlighting important information or frequently accessed content.
+    </Accordion>
     ```
   </Tab>
 </Tabs>
@@ -30,4 +37,8 @@ The Accordion component allows you to create expandable sections in your documen
   The content to be displayed when the accordion is expanded. Can include text, markdown, and components.
 </ParamField>
 
+<ParamField path="defaultOpen" type="boolean" default={false}>
+  Whether the accordion should be open when the page loads. If not specified, the accordion will be collapsed by default.
+</ParamField>
+
 

fern/products/sdks/overview/java/changelog/2025-10-23.mdx

@@ -1,7 +1,7 @@
 ## 3.9.2
 **`(fix):`** Fix nullable field serialization in PATCH requests with wrapped request bodies. Explicit null values
-(Nullable.ofNull()) are now correctly serialized as `{"field": null}` instead of being omitted like
-Nullable.empty().
+`(Nullable.ofNull())` are now correctly serialized as `{"field": null}` instead of being omitted like
+`Nullable.empty()`.
 
 
 ## 3.9.1