fix: rust-doc warnings

.github/workflows/rust.yml

@@ -62,7 +62,7 @@ jobs:
           profile: minimal
           toolchain: stable
           override: true
-          components: rustfmt, clippy
+          components: rustfmt, clippy, rust-docs
       - uses: actions-rs/cargo@v1
         with:
           command: fmt
@@ -72,6 +72,12 @@ jobs:
         with:
           command: clippy
           args: --workspace --all-targets --all-features -- -D warnings
+      - uses: actions-rs/cargo@v1
+        env:
+          RUSTDOCFLAGS: "-D warnings"
+        with:
+          command: doc
+          args: --no-deps --all-features --document-private-items
 
   audit:
     runs-on: ubuntu-latest

src/extensions/rgp/poll.rs

@@ -1,4 +1,4 @@
-//! https://www.verisign.com/assets/epp-sdk/verisign_epp-extension_rgp-poll_v00.html
+//! <https://www.verisign.com/assets/epp-sdk/verisign_epp-extension_rgp-poll_v00.html>
 
 use chrono::{DateTime, Utc};
 use instant_xml::FromXml;

src/extensions/secdns.rs

@@ -137,7 +137,7 @@ impl<'a> DsDataType<'a> {
 }
 
 /// DigestAlgorithm identifies the algorithm used to construct the digest
-/// https://www.iana.org/assignments/ds-rr-types/ds-rr-types.xhtml
+/// <https://www.iana.org/assignments/ds-rr-types/ds-rr-types.xhtml>
 #[derive(Clone, Copy, Debug)]
 // XXX Do NOT derive PartialEq, Hash or Ord because the variant
 // Other(u8) could clash with one of the other variants. They have to
@@ -173,7 +173,7 @@ impl ToXml for DigestAlgorithm {
 }
 
 /// Algorithm identifies the public key's cryptographic algorithm
-/// https://www.iana.org/assignments/dns-sec-alg-numbers/dns-sec-alg-numbers.xhtml#dns-sec-alg-numbers-1
+/// <https://www.iana.org/assignments/dns-sec-alg-numbers/dns-sec-alg-numbers.xhtml#dns-sec-alg-numbers-1>
 #[derive(Clone, Copy, Debug)]
 // XXX Do NOT derive PartialEq, Hash or Ord because the variant
 // Other(u8) could clash with one of the other variants. They have to