fix(review): move PG docs link to SetOf variant, remove parser doc comment

Address review feedback on #2217.

Author: fmguerreiro

src/ast/ddl.rs

@@ -3467,15 +3467,15 @@ impl fmt::Display for CreateDomain {
 }
 
 /// The return type of a `CREATE FUNCTION` statement.
-///
-/// [PostgreSQL](https://www.postgresql.org/docs/current/sql-createfunction.html)
 #[derive(Debug, Clone, PartialEq, PartialOrd, Eq, Ord, Hash)]
 #[cfg_attr(feature = "serde", derive(Serialize, Deserialize))]
 #[cfg_attr(feature = "visitor", derive(Visit, VisitMut))]
 pub enum FunctionReturnType {
     /// `RETURNS <type>`
     DataType(DataType),
     /// `RETURNS SETOF <type>`
+    ///
+    /// [PostgreSQL](https://www.postgresql.org/docs/current/sql-createfunction.html)
     SetOf(DataType),
 }
 

src/parser/mod.rs

@@ -5883,9 +5883,6 @@ impl<'a> Parser<'a> {
         })
     }
 
-    /// Parse a [`FunctionReturnType`] after the `RETURNS` keyword.
-    ///
-    /// Handles `RETURNS SETOF <type>` and plain `RETURNS <type>`.
     fn parse_function_return_type(&mut self) -> Result<FunctionReturnType, ParserError> {
         if self.parse_keyword(Keyword::SETOF) {
             Ok(FunctionReturnType::SetOf(self.parse_data_type()?))