markdownlint/doc-build/md021.md

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This rule is triggered when more than one space is used to separate the
heading text from the hash characters in a closed atx style heading:
```markdown
# Heading 1 #
## Heading 2 ##
```
To fix this, separate the heading text from the hash character by a single
space:
```markdown
# Heading 1 #
## Heading 2 ##
```
Note: this rule will fire if either side of the heading contains multiple
spaces.
Rationale: Extra space has no purpose and does not affect the rendering of
content.