fix(docs): fix markdownlint error in README template

Add empty line and language specifier (text) to fenced code block
in README.md.gotmpl to satisfy markdownlint MD040 rule.

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

charts/jellyfin/README.md.gotmpl

@@ -318,7 +318,8 @@ For more configuration options, see the full values documentation in [values.yam
 ### inotify Instance Limit Reached
 
 **Problem:** Jellyfin crashes with error:
-```
+
+```text
 System.IO.IOException: The configured user limit (128) on the number of inotify instances has been reached
 ```