docs: add Common use cases to chrome_policy page

browsers/pools/policy-json.mdx

@@ -174,6 +174,72 @@ The example above demonstrates setting a default homepage and managed bookmarks.
 | `BookmarkBarEnabled` | `boolean` | Shows the bookmark bar |
 | `ManagedBookmarks` | `array` | Pre-configured bookmarks. Supports folders via nested `children` arrays |
 
+## Common use cases
+
+`chrome_policy` is also accepted directly on `browsers.create()` when you don't need a reserved pool. The examples below use that path.
+
+### Allow pop-ups
+
+Chrome's default blocks pop-ups, which breaks sites that open download dialogs or OAuth windows in a new window. Set `DefaultPopupsSetting` to `1` to allow them (`2` blocks).
+
+<CodeGroup>
+```python Python
+from kernel import Kernel
+
+kernel = Kernel()
+
+browser = kernel.browsers.create(
+    chrome_policy={
+        "DefaultPopupsSetting": 1,
+    }
+)
+```
+
+```typescript Typescript/Javascript
+import Kernel from '@onkernel/sdk';
+
+const kernel = new Kernel();
+
+const browser = await kernel.browsers.create({
+  chrome_policy: {
+    DefaultPopupsSetting: 1,
+  },
+});
+```
+</CodeGroup>
+
+### Control file download behavior
+
+When automating file downloads that trigger permission prompts, combine `DefaultPopupsSetting: 1` with `DownloadRestrictions: 0` to allow all downloads.
+
+<CodeGroup>
+```python Python
+from kernel import Kernel
+
+kernel = Kernel()
+
+browser = kernel.browsers.create(
+    chrome_policy={
+        "DefaultPopupsSetting": 1,
+        "DownloadRestrictions": 0,
+    }
+)
+```
+
+```typescript Typescript/Javascript
+import Kernel from '@onkernel/sdk';
+
+const kernel = new Kernel();
+
+const browser = await kernel.browsers.create({
+  chrome_policy: {
+    DefaultPopupsSetting: 1,
+    DownloadRestrictions: 0,
+  },
+});
+```
+</CodeGroup>
+
 ## Available policies
 
 Any policy listed in the [Chrome Enterprise policy documentation](https://chromeenterprise.google/policies/) can be used in the `chrome_policy` object. Refer to the official docs for the full list of supported policy names, types, and values.