Merge pull request #33316 from nschonni/chore--Turn-on-MD011

chore: Turn on MD011

Author: SyntaxC4

.markdownlint.json

@@ -9,7 +9,6 @@
     "MD007": false,
     "MD009": false,
     "MD010": false,
-    "MD011": false,
     "MD012": false,
     "MD013": false,
     "MD014": false,