message: Fix a formatting issue in the algo module's docs
  The (long) URL in the doc comment of `fn all_simple_paths` causes a formatting issue on e.g. <https://docs.rs/petgraph/0.5.1/petgraph/algo/index.html>.
  This commit moves it to a new paragraph so that it gets omitted from the module's short description.
diff: @@ -10,10 +10,10 @@ use crate::{
  Direction::Outgoing,
  };
  -/// Returns iterator that produces all simple paths from `from` node to `to`, which contains at least `min_intermediate_nodes` nodes
  -/// and at most `max_intermediate_nodes`, if given, limited by graph's order otherwise
  -/// Simple path is path without repetitions
  -/// Algorithm is adopted from https://networkx.github.io/documentation/stable/reference/algorithms/generated/networkx.algorithms.simple_paths.all_simple_paths.html
  +/// Returns an iterator that produces all simple paths from `from` node to `to`, which contains at least `min_intermediate_nodes` nodes
  +/// and at most `max_intermediate_nodes`, if given, or limited by the graph's order otherwise. The simple path is a path without repetitions.
  +///
  +/// This algorithm is adapted from https://networkx.github.io/documentation/stable/reference/algorithms/generated/networkx.algorithms.simple_paths.all_simple_paths.html
  ///
  /// # Example
  /// ```
  