Update Doc/library/decimal.rst

Co-authored-by: Sergey B Kirpichev <[email protected]>

Author: HarryLHW

Doc/library/decimal.rst

@@ -354,7 +354,7 @@ Decimal objects
 
    .. productionlist:: decimal
       sign: "+" | "-"
-      digit: "0" | "1" | "2" | "3" | "4" | "5" | "6" | "7" | "8" | "9"
+      digit: "0"..."9"
       indicator: "e" | "E"
       digits: `digit` [`digit`]...
       decimal_part: `digits` "." [`digits`] | ["."] `digits`