feat(seer): update GHE setup to work with seer (#14617)

This PR updates the GHE configuration settings so that the app will work
seamlessly with Seer.

Author: trillville

docs/organization/integrations/source-code-mgmt/github/index.mdx

@@ -138,11 +138,11 @@ Occasionally, Sentry will request additional permissions to your GitHub account
       </tr>
       <tr>
         <th>Pull Requests </th>
-        <td>Read-only </td>
+        <td>Read & Write </td>
       </tr>
       <tr>
         <th>Repository Contents </th>
-        <td>Read-only </td>
+        <td>Read & Write </td>
       </tr>
       <tr>
         <th>Single File </th>