adding docs for isEmphasized (#3125)

Co-authored-by: Devon Govett <[email protected]>

Author: ktabors

packages/@react-spectrum/tabs/docs/Tabs.mdx

@@ -535,3 +535,33 @@ function Example() {
   );
 }
 ```
+
+### Emphasized
+[View guidelines](https://spectrum.adobe.com/page/tabs/#Emphasis)
+
+```tsx example
+<Tabs aria-label="Chat log emphasized example" isEmphasized>
+  <TabList>
+    <Item key="item1">
+      John Doe
+    </Item>
+    <Item key="item2">
+      Jane Doe
+    </Item>
+    <Item key="item3">
+      Joe Bloggs
+    </Item>
+  </TabList>
+  <TabPanels>
+    <Item key="item1">
+      There is no prior chat history with John Doe.
+    </Item>
+    <Item key="item2">
+      There is no prior chat history with Jane Doe.
+    </Item>
+    <Item key="item3">
+      There is no prior chat history with Joe Bloggs.
+    </Item>
+  </TabPanels>
+</Tabs>
+```