Update README.md
Few additional formatting tweaks
@@ -33,15 +33,19 @@ Docker Secrets
The string `_FILE` may be appended to some of the environment variables listed
below if you are using MySQL or PostgreSQL authentication. This will cause the
startup script to load the values for those variables from files within
-the container. This is useful for specifying sensitive info, ie. passwords for
+the container.
+
+This is useful for specifying sensitive info, ie. passwords for
the database, in secured files instead of plaintext environment variables. This
is generally used for loading values from [Docker secrets](https://docs.docker.com/engine/swarm/secrets/#read-more-about-docker-secret-commands), which are stored at
`/run/secrets/<secret_name>` within the container.
It is important to note that the startup script is configured such that:
+
1. You may mix the use of Docker secrets and normal environment variables.
For example, you may wish to use `MYSQL_USER_FILE` and `MYSQL_PASSWORD_FILE`,
but wish to specify the database name with `MYSQL_DATABASE`
+
2. If both a normal environment variable and its corresponding secret are defined
in the same command line, or section within a [Compose](https://docs.docker.com/compose/) file,
the secret will take precedence. For instance, if both `MYSQL_PASSWORD`
