Document usage of multiple collector config files

content/en/docs/collector/configuration.md

@@ -31,13 +31,23 @@ example:
 otelcol --config=customconfig.yaml
 ```
 
+You can also provide multiple configurations using multiple files at different
+paths. Each file can be a full or partial configuration, and the files can
+reference components from each other. If the merger of files does not constitute
+a complete configuration, the user receives an error since required components
+are not added by default. Pass in multiple file paths at the command line as
+follows:
+
+````shell
+otelcol --config=file:/path/to/first/file --config=file:/path/to/second/file
+
 You can also provide configurations using environment variables, HTTP URIs, or
 YAML paths. For example:
 
 ```shell
 otelcol --config=env:MY_CONFIG_IN_AN_ENVVAR --config=https://server/config.yaml
 otelcol --config="yaml:exporters::debug::verbosity: normal"
-```
+````
 
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