Fix antora-playbook.yml

antora-playbook.yml

@@ -1,8 +1,7 @@
 antora:
-  antora:
-    extensions:
-      - require: '@springio/antora-extensions'
-        root_component_name: 'amqp'
+  extensions:
+    - require: '@springio/antora-extensions'
+      root_component_name: 'amqp'
 
 site:
   title: Spring AMQP
@@ -12,21 +11,21 @@ git:
   ensure_git_suffix: false
 content:
   sources:
-  - url: https://github.com/spring-projects/spring-amqp
-    # Refname matching:
-    # https://docs.antora.org/antora/latest/playbook/content-refname-matching/
-    branches: [ main,'({3..9}).+({0..9}).x', '!(3.0.x)' ]
-    tags: [ 'v({3..9}).+({0..9}).+({0..9})?(-{RC,M}+({0..9}))', '!(v3.0.*)', '!(v3.1.0?(-{RC,M}+({0..9})))']
-    start_path: src/reference/antora
+    - url: https://github.com/spring-projects/spring-amqp
+      # Refname matching:
+      # https://docs.antora.org/antora/latest/playbook/content-refname-matching/
+      branches: [ main,'({3..9}).+({0..9}).x', '!(3.0.x)' ]
+      tags: [ 'v({3..9}).+({0..9}).+({0..9})?(-{RC,M}+({0..9}))', '!(v3.0.*)', '!(v3.1.0?(-{RC,M}+({0..9})))' ]
+      start_path: src/reference/antora
 asciidoc:
   attributes:
     page-stackoverflow-url: https://stackoverflow.com/tags/spring-amqp
     page-related-doc-projects: integration,framework
     hide-uri-scheme: '@'
     tabs-sync-option: '@'
   extensions:
-  - '@asciidoctor/tabs'
-  - '@springio/asciidoctor-extensions'
+    - '@asciidoctor/tabs'
+    - '@springio/asciidoctor-extensions'
 urls:
   latest_version_segment_strategy: redirect:to
   latest_version_segment: ''