Add mention of --log-level in troubleshooting section

and also `--log` and `QUARTO_LOG`

Author: cderv

docs/troubleshooting/index.qmd

@@ -105,6 +105,10 @@ export QUARTO_LOG_LEVEL=DEBUG
 
 :::
 
+`--log-level debug` can also be passed at command line e.g. `quarto render index.qmd --log-level debug`
+
+If you prefer to have the log be written to file, you can set `QUARTO_LOG` in your environment, or `--log` at command line. 
+
 ### Inspect log files {#log-files}
 
 Quarto creates log files that can help you diagnose problems. These are stored in different locations depending on your operating system: