Fixing rustdoc

Author: Lukasz Anforowicz

src/comment.rs

@@ -466,10 +466,12 @@ impl ItemizedBlock {
     /// list marker"](https://spec.commonmark.org/0.30/#ordered-list-marker) is more limited (to at
     /// most 2 digits). Limiting the length of the marker helps reduce the risk of recognizing
     /// arbitrary numbers as markers. See also
-    /// https://talk.commonmark.org/t/blank-lines-before-lists-revisited/1990 which gives the
+    /// <https://talk.commonmark.org/t/blank-lines-before-lists-revisited/1990> which gives the
     /// following example where a number (i.e. "1868") doesn't signify an ordered list:
-    /// >  The Captain died in
-    /// >  1868. He wes buried in...
+    /// ```md
+    /// The Captain died in
+    /// 1868. He wes buried in...
+    /// ```
     fn get_marker_length(trimmed: &str) -> Option<usize> {
         // https://spec.commonmark.org/0.30/#bullet-list-marker or
         // https://spec.commonmark.org/0.30/#block-quote-marker