fix clippy errors

Author: clems4ever

src/core/errors.rs

@@ -9,7 +9,7 @@ where
     V: Copy + Eq,
     HE: Copy + Eq,
 {
-    /// Error when a HyperedgeIndex was not found.
+    /// Error when a `HyperedgeIndex` was not found.
     #[error("HyperedgeIndex {0} was not found")]
     HyperedgeIndexNotFound(HyperedgeIndex),
 
@@ -66,7 +66,7 @@ where
     #[error("At least two hyperedges must be provided to be joined")]
     HyperedgesInvalidJoin,
 
-    /// Error when a VertexIndex was not found.
+    /// Error when a `VertexIndex` was not found.
     #[error("VertexIndex {0} was not found")]
     VertexIndexNotFound(VertexIndex),