Release build - apply review comments

- Rename workflow
- Split artifact upload into packages and docs

.github/workflows/release_build.yml

@@ -1,4 +1,4 @@
-name: Release build
+name: Build release packages and documentation
 on:
   workflow_dispatch:
   push:
@@ -34,11 +34,18 @@ jobs:
       - name: Build package and docs
         run: dotnet run --project 'build/build.fsproj' -- -t All
 
-      - name: Upload artifacts
+      - name: Upload packages
         uses: actions/upload-artifact@v4
         with:
+          name: packages
           path: |
             bin/Release/NSubstitute/*.nupkg
             bin/Release/NSubstitute/*.snupkg
+
+      - name: Upload documentation
+        uses: actions/upload-artifact@v4
+        with:
+          name: docs
+          path: |
             bin/Release/nsubstitute.github.com/