Allow missing docs on deprecated maps methods

src/maps.rs

@@ -39,10 +39,12 @@ impl<V: Copy, T: Clone> VertexMap<V, T> {
     }
 
     #[deprecated(since = "0.2.2", note = "use 'capacity' instead")]
+    #[allow(missing_docs)]
     pub fn len(&self) -> usize {
         self.capacity()
     }
 
+    #[allow(missing_docs)]
     pub fn sync<G: GraphTopology<Vertex = V>>(&mut self, graph: &G) {
         self.inner.resize(graph.vertex_capacity());
     }
@@ -94,10 +96,12 @@ impl<E: Copy, T: Clone> EdgeMap<E, T> {
     }
 
     #[deprecated(since = "0.2.2", note = "use 'capacity' instead")]
+    #[allow(missing_docs)]
     pub fn len(&self) -> usize {
         self.capacity()
     }
 
+    #[allow(missing_docs)]
     pub fn sync<G: GraphTopology<Edge = E>>(&mut self, graph: &G) {
         self.inner.resize(graph.edge_capacity());
     }