correct collector ro docker requirement

gdi/opentelemetry/install-linux-manual.rst

@@ -81,7 +81,7 @@ Run the following command to run an interactive bash shell on the container and
 See :new-page:`docker-compose.yml <https://github.com/signalfx/splunk-otel-collector/blob/main/examples/docker-compose/docker-compose.yml>` in GitHub to download a ``docker-compose`` example.
 
 .. note:: 
-   Ensure that ``ReadonlyRootFileSystem`` is set to ``true`` as the collector needs to write to the container file system on startup.
+   If you are running the Collector in ``--read-only`` mode and using any Smart Agent receiver's legacy collectd monitor types, you need to provide a writable config directory similar to ``--read-only --tmpfs /usr/lib/splunk-otel-collector/agent-bundle/run:uid=999,gid=999`` (default) or as configured by the Smart Agent extension's ``collectd::configDir`` path.