docs: add SSL troubleshooting to delete traces script (#1537)

Add troubleshooting section to the delete traces script documentation to
help users resolve SSL connection issues when attempting to delete
traces from ClickHouse.

## Type of change

**Type:** Update existing documentation

## Additional notes
Users encountering "Could not find trace IDs" errors when running the
delete_trace_by_id script often need to add the `--ssl` flag to properly
connect to ClickHouse. This troubleshooting entry documents the solution
and provides an alternative verification method using `clickhouse-cli`.

---------

Co-authored-by: Lauren Hirata Singh <[email protected]>

Author: niilooy

src/langsmith/script-delete-traces.mdx

@@ -66,3 +66,17 @@ sh delete_trace_by_id.sh "clickhouse://default:password@localhost:8123/default"
 ```
 
 If you visit the LangSmith UI, you should now see all the specified traces have been removed.
+
+## Troubleshooting
+
+### "Could not find trace IDs" error
+
+If you receive an error message stating that trace IDs could not be found, add the `--ssl` flag to your command. Without this flag, the script may not be able to properly connect to ClickHouse, resulting in false "trace ID not found" errors.
+
+Example with SSL flag:
+
+```bash
+sh delete_trace_by_id.sh "clickhouse://default:password@localhost:8123/default" --file path/to/traces.txt --ssl
+```
+
+You can also verify that traces exist by connecting to ClickHouse directly using `clickhouse-cli` and querying for the trace IDs before running the deletion script.