mmc: explicitly mention SDIO support in Kconfig

Signed-off-by: Pierre Ossman <drzeus@drzeus.cx>
diff --git a/drivers/mmc/card/Kconfig b/drivers/mmc/card/Kconfig
index ffd2198..3f2a912 100644
--- a/drivers/mmc/card/Kconfig
+++ b/drivers/mmc/card/Kconfig
@@ -2,7 +2,7 @@
 # MMC/SD card drivers
 #
 
-comment "MMC/SD Card Drivers"
+comment "MMC/SD/SDIO Card Drivers"
 
 config MMC_BLOCK
 	tristate "MMC block device driver"