dt-bindings: mmc: controller: clarify the address-cells description

The term "slot ID" has nothing to do with the SDIO function number
which is specified in the reg property of the subnodes, rephrase
the description to be more accurate.

Fixes: f9b7989 ("dt-bindings: mmc: Add YAML schemas for the generic MMC options")
Signed-off-by: Neil Armstrong <[email protected]>
Acked-by: Rob Herring (Arm) <[email protected]>
Message-ID: <20241128-topic-amlogic-arm32-upstream-bindings-fixes-convert-meson-mx-sdio-v4-1-11d9f9200a59@linaro.org>
Signed-off-by: Ulf Hansson <[email protected]>

Author: superna9999

Documentation/devicetree/bindings/mmc/mmc-controller.yaml

@@ -25,7 +25,7 @@ properties:
   "#address-cells":
     const: 1
     description: |
-      The cell is the slot ID if a function subnode is used.
+      The cell is the SDIO function number if a function subnode is used.
 
   "#size-cells":
     const: 0