minor: remove obsolete comment
[ci skip]
//
//
-// Simulates SPI mode SD card. Currently read-only. When the simulator is
-// initialized, it opens the file specified by the argument +block=<filename>
+// Simulates SPI mode SD card. When the simulator is initialized, it opens the
+// file specified by the argument +block=<filename>
// http://elm-chan.org/docs/mmc/mmc_e.html
//
