update step names and trigger rebuild of preprocessors to see caching in practice

Author: Wondertan

.github/workflows/github_pages.yml

@@ -25,21 +25,21 @@ jobs:
         with:
           mdbook-version: "latest"
 
-      - name: Install mdbook-webinclude
+      - name: Install mdbook-webinclude preprocessor
         uses: actions-rs/[email protected]
         with:
           crate: mdbook-webinclude
           version: latest
           use-tool-cache: true
 
-      - name: Install mdbook-yml-header
+      - name: Install mdbook-yml-header preprocessor
         uses: actions-rs/[email protected]
         with:
           crate: mdbook-yml-header
           version: latest
           use-tool-cache: true
 
-      - name: Install mdbook-pagetoc
+      - name: Install mdbook-pagetoc preprocessor
         uses: actions-rs/[email protected]
         with:
           crate: mdbook-pagetoc