Ignore code blocks from spell checking

.github/actions/spelling/block-delimiters.list

@@ -0,0 +1,7 @@
+# generic ignore spelling block
+<!--begin no spell check-->
+<!--end no spell check-->
+
+# ignore code blocks
+```
+```

.github/workflows/spelling.yaml

@@ -11,7 +11,15 @@ jobs:
       - uses: actions/checkout@v3
       - name: Check spelling
         id: spelling
-        uses: check-spelling/check-spelling@v0.0.24
+        # The given commit contains preliminary, unreleased, support for ignoring
+        # whole blocks (multi-line) from spell checking. See
+        # https://github.com/check-spelling/check-spelling/commit/46c981b7c96b3777aff4fd711fc9a8f126121b04
+        # for more details. 
+        # The given commit contains preliminary, unreleased, support for ignoring
+        # whole blocks (multi-line) from spell checking. See
+        # https://github.com/check-spelling/check-spelling/commit/46c981b7c96b3777aff4fd711fc9a8f126121b04
+        # for more details. 
+        uses: check-spelling/check-spelling@46c981b7c96b3777aff4fd711fc9a8f126121b04
         with:
           check_file_names: 1
           post_comment: 0