Document usage of multiple collector config files

[meswapnilk]

Closes #5296

[tiffany76]

Suggested change

	otelcol --cofig=file:/path/to/first/file --config=file:/path/to/second/file
	otelcol --config=file:/path/to/first/file --config=file:/path/to/second/file

[tiffany76]

@mowies, does this PR address the issue you raised in #5296?

[mowies]

Yes, LGTM!

[tiffany76]

@meswapnilk, could you fix the typo in my earlier comment? Thanks!

[chalin]

LGTM with @tiffany76's suggestion addressed, and approval from @open-telemetry/collector-approvers.

[tiffany76]

Hi @meswapnilk, it looks like some submodule changes were included in your last commit that shouldn't be there. Could you run npm run fix:submodule locally? If that doesn't work, try rebasing. Once those submodules are gone, the conflicts should disappear as well. Thanks.

[meswapnilk]

Hi @meswapnilk, it looks like some submodule changes were included in your last commit that shouldn't be there. Could you run npm run fix:submodule locally? If that doesn't work, try rebasing. Once those submodules are gone, the conflicts should disappear as well. Thanks.

Done

[opentelemetrybot]

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