Documentation: devres: add missing devm_acpi_dma_controller_free() helper

Add missing devm_acpi_dma_controller_free() to devres.rst, it's introduced
by commit 1b2e98b ("dma: acpi-dma: introduce ACPI DMA helpers").

Fixes: 1b2e98b ("dma: acpi-dma: introduce ACPI DMA helpers")
Cc: Andy Shevchenko <[email protected]>
Cc: Mika Westerberg <[email protected]>
Cc: Rafael J. Wysocki <[email protected]>
Cc: Vinod Koul <[email protected]>
Cc: Jonathan Corbet <[email protected]>
Signed-off-by: Yang Yingliang <[email protected]>
Reviewed-by: Andy Shevchenko <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Vinod Koul <[email protected]>

Author: Yang Yingliang

Documentation/driver-api/driver-model/devres.rst

@@ -437,6 +437,7 @@ SERDEV
 
 SLAVE DMA ENGINE
   devm_acpi_dma_controller_register()
+  devm_acpi_dma_controller_free()
 
 SPI
   devm_spi_alloc_master()