Fix typo (CONENT -> CONTENT)
@@ -1269,7 +1269,7 @@ macro_rules! syn {
/// the parentheses in order for this parser to return successfully.
///
/// - **Syntax:** `parens!(CONTENT)`
-/// - **Output:** `(token::Paren, CONENT)`
+/// - **Output:** `(token::Paren, CONTENT)`
///
/// ```rust
/// #[macro_use]
