Minor bugfixes.

action.yml

@@ -11,14 +11,14 @@ inputs:
     default: 'v'
 runs:
   using: "composite"
-  runs-on: ubuntu-latest
   steps:
     - name: Install rust
       uses: actions-rs/toolchain@v1
       with:
         toolchain: nightly
         profile: minimal
-    - run: |
+    - name: Build rustdoc and check it
+      run: |
         # Colorize output, since GitHub Actions terminals support color.
         export CARGO_TERM_COLOR=always