added documentation generation for api outputs

CHANGELOG.md

Civi/DataProcessor/Output/Api.php

Civi/DataProcessor/Source/Contact/RelationshipSource.php

packages/markdown-it/CHANGELOG.md

packages/markdown-it/LICENSE

packages/markdown-it/README.md

packages/markdown-it/bin/markdown-it.js

packages/markdown-it/dist/markdown-it.js

packages/markdown-it/dist/markdown-it.min.js

packages/markdown-it/index.js

packages/markdown-it/lib/common/entities.js

packages/markdown-it/lib/common/html_blocks.js

packages/markdown-it/lib/common/html_re.js

packages/markdown-it/lib/common/utils.js

packages/markdown-it/lib/helpers/index.js

packages/markdown-it/lib/helpers/parse_link_destination.js

packages/markdown-it/lib/helpers/parse_link_label.js

packages/markdown-it/lib/helpers/parse_link_title.js

packages/markdown-it/lib/index.js

packages/markdown-it/lib/parser_block.js