markdownlint/test/heading_trailing_punctuation_customized.md

# Heading 1 {MD026}.

## Heading 2 {MD026},

## Heading 3!

## Heading 4 {MD026}:

## Heading 5 {MD026};

## Heading 6 {MD026}?

## Heading 7 {MD026}]

The rule has been customized to allow exclamation point while disallowing
everything else.