chore(ci): more markdown fixes (#845)

Signed-off-by: Dan Webb <dan.webb@damacus.io>

Author: damacus

.markdownlint-cli2.yaml

@@ -3,6 +3,7 @@ config:
   line-length: false # MD013
   no-duplicate-heading: false # MD024
   reference-links-images: false # MD052
-  no-multiple-blanks: false # MD012 CHANGELOG.md
+  no-multiple-blanks:
+    maximum: 2
 ignores:
   - .github/copilot-instructions.md