Clarify order and promotion/demotion for horizontal rule strings
tree8882efd1f6be7154d30e4abf4374a240861eead1
-rw-r--r-- 6 .gitignore
-rw-r--r-- 179358 markdown-mode.el
drwxr-xr-x - tests
-rwxr-xr-x 993 webpage.sh