This change adds support for comments with multiple pound signs
so this example becomes valid and no longer raises lint problems:
---
## This is a section
section1_key: value
YAML content like the following one produced an error, because the
ScalarToken associated whose value is "this is plain text" ends at the
beginning of the 5th line (the one with the comment):
---
string: >
this is plain text
# comment
