tidy-up: fix yamllint whitespace issues

Closes #12466

.github/scripts/spellcheck.yaml

@@ -4,29 +4,29 @@
 #
 # Docs: https://github.com/UnicornGlobal/spellcheck-github-actions
 matrix:
-- name: Markdown
-  expect_match: false
-  apsell:
-    mode: en
-  dictionary:
-    wordlists:
-    - wordlist.txt
-    output: wordlist.dic
-    encoding: utf-8
-  pipeline:
-  - pyspelling.filters.markdown:
-      markdown_extensions:
-      - markdown.extensions.extra:
-  - pyspelling.filters.html:
-      comments: true
-      attributes:
-      - title
-      - alt
-      ignores:
-      - ':matches(code, pre)'
-      - 'code'
-      - 'pre'
-      - 'strong'
-      - 'em'
-  sources:
-  - '**/*.md|!docs/BINDINGS.md'
+  - name: Markdown
+    expect_match: false
+    apsell:
+      mode: en
+    dictionary:
+      wordlists:
+        - wordlist.txt
+      output: wordlist.dic
+      encoding: utf-8
+    pipeline:
+      - pyspelling.filters.markdown:
+          markdown_extensions:
+            - markdown.extensions.extra:
+      - pyspelling.filters.html:
+          comments: true
+          attributes:
+            - title
+            - alt
+          ignores:
+            - ':matches(code, pre)'
+            - 'code'
+            - 'pre'
+            - 'strong'
+            - 'em'
+    sources:
+      - '**/*.md|!docs/BINDINGS.md'