Fix some links & link tests

Not all, but these seem to be a bug in the generator?

Author: vorner

.github/workflows/test.yaml

@@ -81,11 +81,16 @@ jobs:
 
       - name: Check links
         run: |
+          # Prepare "full" build including dependencies for deadlinks
+          cargo doc --all --all-features
           for package in $(cargo metadata --no-deps --format-version=1 | jq -r '.packages[] | .name'); do
-            cargo rustdoc -p "$package" --all-features -- -D warnings
             dname=$(echo "$package" | tr '-' '_')
             cargo deadlinks --dir "target/doc/$dname" --check-http --ignore-fragments
           done
+          # Try building each separately with enabling warnings as errors
+          for package in $(cargo metadata --no-deps --format-version=1 | jq -r '.packages[] | .name'); do
+            cargo rustdoc -p "$package" --all-features -- -D warnings
+          done
 
   ancient-registry:
     name: Check compilation of signal-hook-registry on old compilers

src/iterator/backend.rs

@@ -148,8 +148,7 @@ impl<E: Exfiltrator> AddSignal for PendingSignals<E> {
     }
 }
 
-/// A struct to control an instance of an associated type
-/// (like for example [`Signals`][super::Signals]).
+/// A struct to control an instance of signal delivery.
 ///
 /// It allows to register more signal handlers and to shutdown the signal
 /// delivery. You can [`clone`][Handle::clone] this type which isn't a