Fix trailing whitespace in docker-compose.md

Signed-off-by: Aanand Prasad <[email protected]>

docs/reference/docker-compose.md

@@ -87,9 +87,9 @@ relative to the current working directory.
 The `-f` flag is optional. If you don't provide this flag on the command line,
 Compose traverses the working directory and its parent directories looking for a
 `docker-compose.yml` and a `docker-compose.override.yml` file. You must
-supply at least the `docker-compose.yml` file. If both files are present on the 
-same directory level, Compose combines the two files into a single configuration. 
-The configuration in the `docker-compose.override.yml` file is applied over and 
+supply at least the `docker-compose.yml` file. If both files are present on the
+same directory level, Compose combines the two files into a single configuration.
+The configuration in the `docker-compose.override.yml` file is applied over and
 in addition to the values in the `docker-compose.yml` file.
 
 See also the `COMPOSE_FILE` [environment variable](overview.md#compose-file).