Edit doc

Author: bjsignalfx

docs/getting-started/linux-manual.md

@@ -201,7 +201,9 @@ $ docker run --rm \
     -e SPLUNK_CONFIG_YAML=${CONFIG_YAML} \
     --name otelcol quay.io/signalfx/splunk-otel-collector:latest
 ```
-The YAML in the first command configures the Collector to collect and
-log cpu metrics. The YAML is assigned to parameter `CONFIG_YAML` for
-convenience. `CONFIG_YAML` is expanded and assigned to
-`SPLUNK_CONFIG_YAML` in the subsequent `docker run` command.
+The configuration YAML above is for collecting and logging cpu
+metrics. The YAML is assigned to parameter `CONFIG_YAML` for
+convenience in the first command. In the subsequent `docker run`
+command, parameter `CONFIG_YAML` is expanded and assigned to
+environment variable `SPLUNK_CONFIG_YAML`. Note that YAML 
+requires whitespace indentation to be maintained.