Update crypto-sdcard.spec

rpm/crypto-sdcard.spec

@@ -3,7 +3,7 @@ Summary:       Configuration files for unlocking and mounting encrypted SD-cards
 Version:       1.7.2
 # Since v1.3.1, the release version consists of two or three fields, separated by a dot ("."):
 # - The first field must contain a natural number greater than zero.
-#   This number may be prefixed by one of {alpha,beta,stable}, e.g. "alpha13".
+#   This number may be prefixed by one of {alpha,beta,rc,stable}, e.g. "alpha13".
 # - The second field indicates the minimal required SailfishOS version A.B.C.X in the format "sfosABC";
 #   the fourth field of a SailfishOS version ("X") is neither depended upon or denoted.
 #   A single, additional word out of {regular,qcrypto} is directly appended, resulting in the whole