Fix warnings

src/query/contact_manifolds/contact_manifolds_pfm_pfm.rs

@@ -6,7 +6,6 @@ use crate::query::{
 };
 use crate::shape::{PackedFeatureId, PolygonalFeature, PolygonalFeatureMap, Shape};
 use na::Unit;
-use std::any::Any;
 
 /// Computes the contact manifold between two convex shapes implementing the `PolygonalSupportMap`
 /// trait, both represented as `Shape` trait-objects.

src/shape/polygonal_feature_map.rs

@@ -21,6 +21,7 @@ pub trait PolygonalFeatureMap: SupportMap {
     // TODO: this is currently just a workaround for https://github.com/dimforge/rapier/issues/417
     //       until we get a better way to deal with the issue without breaking internal edges
     //       handling.
+    /// Is this shape a `ConvexPolyhedron`?
     fn is_convex_polyhedron(&self) -> bool {
         false
     }