test: add bad markdown to verify auto-fixes

Author: EmersonFras

lint-fail-test.md

@@ -0,0 +1,13 @@
+#Auto-Fixable Header (No space after hash)
+
+This paragraph has trailing spaces at the end.    
+
+# Duplicate Header
+Content A
+
+# Duplicate Header
+Content B (Linter won't be able to fix the duplicate header but should point it out)
+
+<div class="error">
+  Inline HTML is also not auto-fixable
+</div>