markdownlint/doc-build/md001.md

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This rule is triggered when you skip heading levels in a Markdown document, for
example:
```markdown
# Heading 1
### Heading 3
We skipped out a 2nd level heading in this document
```
When using multiple heading levels, nested headings should increase by only one
level at a time:
```markdown
# Heading 1
## Heading 2
### Heading 3
#### Heading 4
## Another Heading 2
### Another Heading 3
```
Rationale: Headings represent the structure of a document and can be confusing
when skipped - especially for accessibility scenarios. More information:
<https://www.w3.org/WAI/tutorials/page-structure/headings/>.