message: DOC: Fix typo in time
  Everywhere in docs we use |V| for the number of nodes ("size of the vertex set")
diff: @@ -408,7 +408,7 @@ impl<N, E, Ty> GraphMap<N, E, Ty>
  /// node weights in the resulting `Graph`, too.
  /// 2. Note that the index type is user-chosen.
  ///
  - /// Computes in **O(|N| + |E|)** time (average).
  + /// Computes in **O(|V| + |E|)** time (average).
  ///
  /// **Panics** if the number of nodes or edges does not fit with
  /// the resulting graph's index type.
  