fix(docs): rename duplicate Troubleshooting heading in README template

Fixes MD024 markdownlint error by renaming the NetworkPolicy section
heading from 'Troubleshooting' to 'NetworkPolicy Troubleshooting' to
avoid duplication with the inotify troubleshooting section.

Co-Authored-By: Claude <noreply@anthropic.com>
Signed-off-by: Aleksei Sviridkin <f@lex.la>

charts/jellyfin/README.md.gotmpl

@@ -292,7 +292,7 @@ networkPolicy:
 
 4. **Testing**: Always test NetworkPolicy changes in a development environment first. Misconfigured policies can block legitimate traffic.
 
-### Troubleshooting
+### NetworkPolicy Troubleshooting
 
 **Jellyfin can't download metadata/images:**
 - Check that `egress.allowAllEgress: true` or `restrictedEgress.allowMetadata: true` is set