Documentation of TF_LOG taking log levels.

As of 0090c063e it is now possible to filter the logs by level by setting TF_LOG to one of the known log level names.
11 years ago · 200a42ab46
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--- a/website/source/docs/internals/debugging.html.md
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 # Debugging Terraform

-Terraform has detailed logs which can be enabled by setting the TF_LOG environmental variable to any value. This will cause detailed logs to appear on stderr.
+Terraform has detailed logs which can be enabled by setting the `TF_LOG` environmental variable to any value. This will cause detailed logs to appear on stderr.
+
+You can set `TF_LOG` to one of the log levels `TRACE`, `DEBUG`, `INFO`, `WARN` or `ERROR` to change the verbosity of the logs. `TRACE` is the most verbose and it is the default if `TF_LOG` is set to something other than a log level name.

 To persist logged output you can set TF_LOG_PATH in order to force the log to always go to a specific file when logging is enabled. Note that even when TF_LOG_PATH is set, TF_LOG must be set in order for any logging to be enabled.