Add link to CSI driver LOGGING.md to Mountpoint LOGGING.md (#925)

We added a new logging document in the CSI Driver project, which helps support locating the logs on the underlying host. This isn't visible from the Mountpoint repository including troubleshooting guides, so let's link it from MP's logging documentation.

Signed-off-by: Daniel Carl Jones <djonesoa@amazon.com>

doc/LOGGING.md

@@ -8,6 +8,10 @@ On other systems, syslog entries are likely written to a file such as `/var/log/
 
 When running `mount-s3` in foreground mode (the `-f, --foreground` command-line argument), Mountpoint will emit logs to stdout in addition to syslog or any configured log directory (see below).
 
+> [!NOTE]
+> If you are using [Mountpoint for Amazon S3 CSI Driver](https://github.com/awslabs/mountpoint-s3-csi-driver/), logs will be written to the syslog on the underlying node.
+> Follow [Mountpoint CSI Driver's LOGGING.md guide](https://github.com/awslabs/mountpoint-s3-csi-driver/blob/main/docs/LOGGING.md) to learn about how to get logs for both Mountpoint and the driver itself.
+
 ## Logging to a file
 
 You can direct logs to a file instead of syslog by providing a destination directory using the `-l, --log-directory` command-line argument with `mount-s3`.