Strip legacy FA4 class from uudoc-generated platform icons

mdbook 0.5's built-in Font Awesome parser sees the legacy `fa` class
that uudoc emits and defaults to type=regular, failing to find
linux/windows/apple (which live under `brands`) and spamming hundreds
of WARN lines per build. Drop the `fa ` prefix between uudoc and
mdbook build for both English and translated docs.

.github/workflows/website.yml

@@ -101,6 +101,10 @@ jobs:
         cd docs
         # Remove deprecated 'multilingual' field unsupported by newer mdbook
         sed -i '/^multilingual/d' book.toml
+        # Strip the legacy FA4 `fa` class from uudoc-generated platform icons
+        # so mdbook 0.5's Font Awesome parser picks up the `fa-brands` family
+        # instead of defaulting to `regular` and warning about linux/windows/apple.
+        find src/utils -name '*.md' -exec sed -i 's|class="fa fa-brands |class="fa-brands |g' {} +
         mdbook build
 
     - name: Build Coreutils Docs (translations)

scripts/build-docs-l10n.sh

@@ -240,6 +240,9 @@ for lang in "${!LANG_MAP[@]}"; do
 
   # Build mdbook to a language-specific output directory
   sed -i '/^multilingual/d' docs/book.toml
+  # Strip legacy FA4 `fa` class so mdbook 0.5's Font Awesome parser picks up
+  # the `fa-brands` family for linux/windows/apple icons (avoids WARN spam).
+  find docs/src/utils -name '*.md' -exec sed -i 's|class="fa fa-brands |class="fa-brands |g' {} +
   (cd docs && mdbook build -d "book-${lang}")
 
   # Restore en-US.ftl files for next iteration