commit 5b2d8da71efe7b9cb0a1a9487601ed99653cd4cd
author martin frances <martinfrances107@hotmail.com> Thu Apr 11 23:12:07 2024 +0100
committer GitHub <noreply@github.com> Fri Apr 12 00:12:07 2024 +0200
tree ad96f73e4831380a0babbf13e298007a0767f50f
parent 5cabfe3e569bebc90221c7eb3832b26630bb1417

Minor: Cargo doc fixup. (#630)

Clippy suggests using this markdown convention when discussing unsafe
code.

A new heading and section is added.

This is how the updated page looks 


![Safe](https://github.com/petgraph/petgraph/assets/1259969/da94c8de-46d3-4251-9a72-c5399683d73c)

src/graph_impl/mod.rs

diff --git a/src/graph_impl/mod.rs b/src/graph_impl/mod.rs
index 579ad7a..a5ce807 100644
--- a/src/graph_impl/mod.rs
+++ b/src/graph_impl/mod.rs
@@ -29,6 +29,8 @@
 
 /// Trait for the unsigned integer type used for node and edge indices.
 ///
+/// # Safety
+///
 /// Marked `unsafe` because: the trait must faithfully preserve
 /// and convert index values.
 pub unsafe trait IndexType: Copy + Default + Hash + Ord + fmt::Debug + 'static {