Fix preview link references in 2 rule docs (#14060)

crates/ruff_linter/src/rules/flake8_simplify/rules/key_in_dict.rs

@@ -37,8 +37,6 @@ use crate::checkers::ast::Checker;
 ///
 /// ## References
 /// - [Python documentation: Mapping Types](https://docs.python.org/3/library/stdtypes.html#mapping-types-dict)
-///
-/// [preview]: https://docs.astral.sh/ruff/preview/
 #[violation]
 pub struct InDictKeys {
     operator: String,

crates/ruff_linter/src/rules/pycodestyle/rules/ambiguous_variable_name.rs

@@ -33,6 +33,7 @@ use crate::rules::pycodestyle::helpers::is_ambiguous_name;
 /// of stubs: a well-written stub should aim to faithfully represent the
 /// interface of the equivalent .py file as it exists at runtime, including any
 /// ambiguously named variables in the runtime module.
+/// [preview]: https://docs.astral.sh/ruff/preview/
 
 #[violation]
 pub struct AmbiguousVariableName(pub String);