Clarify that invalid format identifiers raise Unsupported.

- Also adding a custom domain to the build action.

Author: erbsland-dev

.github/workflows/build-docs.yml

@@ -23,6 +23,13 @@ jobs:
       - name: Build documentation
         run: sphinx-build doc _build
 
+      - name: Set CNAME if in public repo
+        id: cname
+        run: |
+          if [ "${{ github.repository }}" = "erbsland/erbsland-lang-config-doc" ]; then
+            echo "CNAME=config-lang.erbsland.dev" >> $GITHUB_ENV
+          fi
+
       - name: Deploy
         uses: peaceiris/actions-gh-pages@v3
         if: ${{ github.event_name == 'push' && github.ref == 'refs/heads/main' }}
@@ -31,3 +38,4 @@ jobs:
           github_token: ${{ secrets.GITHUB_TOKEN }}
           publish_dir: _build/
           force_orphan: true
+          cname: ${{ env.CNAME }}

doc/reference/byte-data-value.rst

@@ -379,7 +379,9 @@ Errors
         -   |   Raised if the spacing does not align with the bytes.
             |   Raised if non-hexadecimal or illegal characters are present in the content.
             |   Raised if the closing sequence is missing.
-            |   Raised if an unknown format is specified.
+            |   Raised if an invalid format identifier is specified.
+    *   -   :text-code:`Unsupported`
+            Raised if an unknown but valid format identifier is specified.
     *   -   :text-code:`Indentation`
         -   |   Raised if no space or tab character is present before a continued byte-data line.
             |   Raised if the indentation pattern does not match the first entry for multi-line byte-data.