fix(parquet): fix rustdoc links of the adaptive filter placement

`cargo doc` with `-D warnings` rejected a link to the removed
`ConjunctSiteKey` and two redundant explicit link targets.

PR: #25727

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

Author: adriangb

datafusion/datasource-parquet/src/decoder_projection.rs

@@ -271,7 +271,7 @@ impl PostScanFilter {
     /// The order to evaluate the conjuncts for the next batch, as indexes
     /// into `conjuncts`: by the pooled measurements of the conjuncts (rows
     /// removed for each nanosecond, see
-    /// [`evaluation_order`](crate::row_filter_cost::evaluation_order)), the
+    /// [`evaluation_order`]), the
     /// conjuncts without enough measurements first in their order. The
     /// post-scan filter can change its order at each batch for free, thus a
     /// file with few row groups does not keep the written order until its

datafusion/datasource-parquet/src/filter_placement/stats.rs

@@ -42,7 +42,7 @@ pub(crate) struct Observation {
     /// Rows that passed the conjunct.
     pub(crate) rows_out: u64,
     /// Rows in windows where no row passed the conjunct, see
-    /// [`skippable_rows`](crate::row_filter_cost::skippable_rows) and [`StageSelection`].
+    /// [`skippable_rows`] and [`StageSelection`].
     pub(crate) skippable_rows: u64,
     /// Evaluation time of the conjunct, in nanoseconds.
     pub(crate) nanos: u64,
@@ -420,7 +420,7 @@ impl PlacementSites {
 
     /// The statistics of the conjunct at `position` in `conjuncts` (the
     /// conjuncts of the root `AND` chain of a file predicate). The scan
-    /// predicate has `scan_count` conjuncts. See [`ConjunctSiteKey`].
+    /// predicate has `scan_count` conjuncts. See [`ConjunctKey`].
     pub(crate) fn stats_for(
         &self,
         conjuncts: &[&Arc<dyn PhysicalExpr>],