typo

Author: robstoll

docs/docs/reference/enums/desugarEnums.md

@@ -13,7 +13,7 @@ some terminology and notational conventions:
 
  - We use `E` as a name of an enum, and `C` as a name of a case that appears in `E`.
  - We use `<...>` for syntactic constructs that in some circumstances might be empty. For instance,
-   `<value-params>` represents one or more a parameter lists `(...)` or nothing at all.
+   `<value-params>` represents one or more parameter lists `(...)` or nothing at all.
 
  - Enum cases fall into three categories: