hedy cb1c108a0c fix(markdown): Ensure content is followed by '#' ...

Before this commit, empty headings are taken into account:

   # a normal heading

   below is not a good heading:

   #

   below is also not a good heading:

   ##

   These should not be listed in the outline.

2023-11-07 21:14:39 +08:00

..

symbols-outline

fix(markdown): Ensure content is followed by '#'

2023-11-07 21:14:39 +08:00