Deny broken doc intra-links and build docs in CI

.github/workflows/rust.yml

@@ -39,3 +39,18 @@ jobs:
       - name: Running test script
         env: ${{ matrix.env }}
         run: ./contrib/test.sh
+
+  Docs:
+    name: Docs
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout Crate
+        uses: actions/checkout@v2
+      - name: Checkout Toolchain
+        uses: actions-rs/toolchain@v1
+        with:
+          profile: minimal
+          toolchain: stable
+          override: true
+      - name: Create Doc
+        run: cargo doc

src/lib.rs

@@ -36,6 +36,7 @@
 #![deny(unused_imports)]
 #![deny(missing_docs)]
 #![deny(unused_must_use)]
+#![deny(broken_intra_doc_links)]
 
 // Re-exported dependencies.
 #[macro_use] pub extern crate bitcoin_hashes as hashes;