docs(config): better documentation for log levels

Signed-off-by: Thaddeus Kuah <[email protected]>

Author: thaddeuskkr

.env.example

@@ -14,4 +14,6 @@ PROHIBITED_SLUGS=""
 PROHIBITED_CHARACTERS_IN_SLUGS=""
 
 # Log level for the server, defaults to "info".
+# Possible values: "trace", "debug", "info", "warn", "error", "fatal".
+# Set to "silent" to disable logging. If the value is invalid, Nova will probably not start.
 LOG_LEVEL=""