chore(v2): prepare v2.0.0-beta.6 release (#5473)

* add beta.6

* v2.0.0-beta.6

website/versioned_docs/version-2.0.0-beta.6/guides/markdown-features/markdown-features-headings.mdx

@@ -0,0 +1,59 @@
+---
+id: headings
+title: Headings
+description: Using Markdown headings
+slug: /markdown-features/headings
+---
+
+## Markdown headings {#markdown-headings}
+
+You can use regular Markdown headings.
+
+```
+## Level 2 title
+
+### Level 3 title
+
+#### Level 4 title
+```
+
+Markdown headings appear as a table-of-contents entry.
+
+## Heading ids {#heading-ids}
+
+Each heading has an id that can be automatically generated, or explicitly specified.
+
+Heading ids allow you to link to a specific document heading in Markdown or JSX:
+
+```md
+[link](#heading-id)
+```
+
+```jsx
+<Link to="#heading-id">link</Link>
+```
+
+### Generated ids {#generated-ids}
+
+By default, Docusaurus will generate heading ids for you, based on the heading text.
+
+`### Hello World` will have id `hello-world`.
+
+Generated ids have **some limits**:
+
+- The id might not look good
+- You might want to **change or translate** the text without updating the existing id
+
+### Explicit ids {#explicit-ids}
+
+A special Markdown syntax lets you set an **explicit heading id**:
+
+```md
+### Hello World {#my-explicit-id}
+```
+
+:::tip
+
+Use the **[write-heading-ids](../../cli.md#docusaurus-write-heading-ids-sitedir)** CLI command to add explicit ids to all your Markdown documents.
+
+:::