chore: fix bug reporting template (#1288)

Author: mxschmitt

.github/ISSUE_TEMPLATE/bug.md

@@ -18,6 +18,14 @@ assignees: ''
 
 Help us help you! Put down a short code snippet that illustrates your bug and
 that we can run and debug locally.
+
+```python
+from playwright.sync_api import sync_playwright
+with sync_playwright() as p:
+    browser = p.chromium.launch()
+    page = browser.new_page()
+    # ...
+    browser.close()
 ```
 
 **Describe the bug**