ci: Check for doc warnings (atsamd-rs#847)

* Check for doc warnings in CI

* Rename "format" job to "check"

Author: jbeaurivage

.github/workflows/check-docs.yml

@@ -0,0 +1,24 @@
+name: Check docs
+
+on:
+  push:
+    branches: [ master ]
+  pull_request:
+    branches: [ master ]
+
+env:
+  CARGO_TERM_COLOR: always
+
+jobs:
+  check:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout sources
+        uses: actions/checkout@v4
+      - name: Install Rust
+        run: |
+          rustup set profile minimal
+      - name: rustdoc
+        run: |
+          RUSTDOCFLAGS="-Dwarnings" cargo doc --no-deps -F samd21g,dma,async,usb,defmt,rtic
+          RUSTDOCFLAGS="-Dwarnings" cargo doc --no-deps -F samd51j,dma,async,usb,defmt,rtic,can

.github/workflows/rustfmt.yml

@@ -10,7 +10,7 @@ env:
   CARGO_TERM_COLOR: always
 
 jobs:
-  format:
+  check:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout sources