Update _docset.yml and fix broken link

- Add all 33 syntax pages back to the table of contents
- Fix cumulative-docs link in branching-strategy.md to point to docs-content

Author: leemthompo

docs/_docset.yml

@@ -80,6 +80,39 @@ toc:
     children:
       - file: index.md
       - file: quick-ref.md
+      - file: headings.md
+      - file: admonitions.md
+      - file: applies.md
+      - file: applies-switch.md
+      - file: automated_settings.md
+      - file: code.md
+      - file: comments.md
+      - file: conditionals.md
+      - file: csv-include.md
+      - hidden: diagrams.md
+      - file: directives.md
+      - file: dropdowns.md
+      - file: definition-lists.md
+      - file: example_blocks.md
+      - file: file_inclusion.md
+      - file: frontmatter.md
+      - file: icons.md
+      - file: images.md
+      - file: kbd.md
+      - file: math.md
+      - file: lists.md
+      - file: line_breaks.md
+      - file: links.md
+      - file: passthrough.md
+      - file: sidebars.md
+      - file: stepper.md
+      - file: substitutions.md
+      - file: version-variables.md
+      - file: sundries.md
+      - file: tables.md
+      - file: tabs.md
+      - file: tagged_regions.md
+      - file: titles.md
   - folder: cli
     children:
       - file: index.md

docs/contribute/branching-strategy.md

@@ -63,7 +63,7 @@ Add an action as part of that repo’s release process for the release manager t
 When these releases happen, create a PR against the [`assembler.yml`](https://github.com/elastic/docs-builder/blob/main/config/assembler.yml) that defines the new `current` branch, to merge on release day.
 
 :::{tip}
-Regardless of the branching strategy, you also need to update the current version in [`versions.yml`](https://github.com/elastic/docs-builder/blob/main/config/versions.yml) as part of your release process. This version number is used in documentation variables and drives our [dynamic version badge logic](/contribute/cumulative-docs/index.md#how-do-these-tags-behave-in-the-output).
+Regardless of the branching strategy, you also need to update the current version in [`versions.yml`](https://github.com/elastic/docs-builder/blob/main/config/versions.yml) as part of your release process. This version number is used in documentation variables and drives our [dynamic version badge logic](https://www.elastic.co/docs/contribute-docs/how-to/cumulative-docs/index#how-do-these-tags-behave-in-the-output).
 :::