Fix bare URL in private docs

Author: ictrobot

crates/year2016/src/day16.rs

@@ -117,7 +117,7 @@ impl<'a> Day16<'a> {
         output
     }
 
-    /// See https://www.reddit.com/r/adventofcode/comments/5ititq/2016_day_16_c_how_to_tame_your_dragon_in_under_a/
+    /// See <https://www.reddit.com/r/adventofcode/comments/5ititq/2016_day_16_c_how_to_tame_your_dragon_in_under_a/>
     fn dragon_parity(n: u32) -> bool {
         let gray = n ^ (n >> 1);
         ((n & gray).count_ones() ^ gray) & 1 != 0

lefthook.yaml

@@ -13,3 +13,7 @@ pre-commit:
       run: cargo nextest run --all
     doctest:
       run: cargo test --doc --all
+    docs:
+      run: cargo doc --document-private-items
+      env:
+        RUSTDOCFLAGS: -Dwarnings