docs: add missing OAuth scopes to .env.example (sooperset#766)

Add required OAuth scopes that were missing from the example:
- read:jira-user: Required for Jira user operations
- read:confluence-content.summary: Required for Confluence content
- search:confluence: Required for Confluence search
- read:page:confluence: Granular scope required for Confluence v2 API

The read:page:confluence scope is particularly important as OAuth
authentication uses the v2 API which requires this granular scope
for page operations.

Author: sooperset

.env.example

@@ -61,7 +61,7 @@ CONFLUENCE_URL=https://your-company.atlassian.net/wiki
 #ATLASSIAN_OAUTH_CLIENT_ID=your_oauth_client_id
 #ATLASSIAN_OAUTH_CLIENT_SECRET=your_oauth_client_secret
 #ATLASSIAN_OAUTH_REDIRECT_URI=http://localhost:8080/callback # Must match your app's redirect URI
-#ATLASSIAN_OAUTH_SCOPE=read:jira-work write:jira-work read:confluence-space.summary read:confluence-content.all write:confluence-content offline_access # IMPORTANT: 'offline_access' is crucial for refresh tokens
+#ATLASSIAN_OAUTH_SCOPE=read:jira-work write:jira-work read:jira-user read:confluence-space.summary read:confluence-content.summary read:confluence-content.all write:confluence-content search:confluence read:page:confluence offline_access # IMPORTANT: 'offline_access' is crucial for refresh tokens
 
 # Required for the server AFTER running --oauth-setup (this ID is printed by the setup wizard):
 #ATLASSIAN_OAUTH_CLOUD_ID=your_atlassian_cloud_id_from_oauth_setup