Include cust_raw in cargo doc testing on CI.

Now that all the warnings have been fixed.

Author: nnethercote

.github/workflows/ci_linux.yml

@@ -168,8 +168,7 @@ jobs:
         run: |
           docker exec "$CONTAINER_NAME" bash -lc 'set -euo pipefail
             export RUSTDOCFLAGS=-Dwarnings
-            cargo doc --workspace --all-features --document-private-items --no-deps \
-              --exclude cust_raw
+            cargo doc --workspace --all-features --document-private-items --no-deps
           '
 
       - name: Normalize build artifacts ownership

.github/workflows/ci_windows.yml

@@ -110,7 +110,7 @@ jobs:
       - name: Check documentation
         env:
           RUSTDOCFLAGS: -Dwarnings
-        run: cargo doc --workspace --all-features --document-private-items --no-deps --exclude cudnn --exclude cudnn-sys --exclude cust_raw
+        run: cargo doc --workspace --all-features --document-private-items --no-deps --exclude cudnn --exclude cudnn-sys
 
       # Disabled due to dll issues, someone with Windows knowledge needed
       # - name: Compiletest