MAINTAINERS: add path for UART samples

Adding UART samples to "Drivers: Serial/UART" so that the maintainer
will be notified for relevant PRs in the future.

Signed-off-by: Martin Jäger <[email protected]>

Author: martinjaeger

MAINTAINERS.yml

@@ -854,6 +854,7 @@ Documentation:
         - include/drivers/uart.h
         - include/drivers/uart/
         - dts/bindings/serial/
+        - samples/drivers/uart/
         - tests/drivers/uart/
     labels:
         - "area: UART"