Add @springio/asciidoctor-extensions/javadoc-extension

See gh-41605

buildSrc/src/main/java/org/springframework/boot/build/antora/Extensions.java

@@ -52,6 +52,7 @@ public final class Extensions {
 		List<Extension> extensions = new ArrayList<>();
 		extensions.add(new Extension("@asciidoctor/tabs"));
 		extensions.add(new Extension("@springio/asciidoctor-extensions", "@springio/asciidoctor-extensions",
+				"@springio/asciidoctor-extensions/javadoc-extension",
 				"@springio/asciidoctor-extensions/configuration-properties-extension",
 				"@springio/asciidoctor-extensions/section-ids-extension"));
 		asciidoc = List.copyOf(extensions);

buildSrc/src/main/resources/org/springframework/boot/build/antora/antora-playbook-template.yml

@@ -9,6 +9,7 @@ asciidoc:
   attributes:
     chomp: all
     hide-uri-scheme: '@'
+    javadoc-location: xref:api:java/
     page-pagination: ''
     page-stackoverflow-url: https://stackoverflow.com/tags/spring-boot
     tabs-sync-option: '@'
@@ -16,6 +17,7 @@ asciidoc:
     - '@asciidoctor/tabs'
     - '@springio/asciidoctor-extensions'
     - '@springio/asciidoctor-extensions/configuration-properties-extension'
+    - '@springio/asciidoctor-extensions/javadoc-extension'
     - '@springio/asciidoctor-extensions/section-ids-extension'
 urls:
   latest_version_segment: ''

buildSrc/src/test/resources/org/springframework/boot/build/antora/expected-playbook.yml

@@ -31,6 +31,7 @@ asciidoc:
   attributes:
     chomp: all
     hide-uri-scheme: '@'
+    javadoc-location: xref:api:java/
     page-pagination: ''
     page-stackoverflow-url: https://stackoverflow.com/tags/spring-boot
     tabs-sync-option: '@'
@@ -38,6 +39,7 @@ asciidoc:
   - '@asciidoctor/tabs'
   - '@springio/asciidoctor-extensions'
   - '@springio/asciidoctor-extensions/configuration-properties-extension'
+  - '@springio/asciidoctor-extensions/javadoc-extension'
   - '@springio/asciidoctor-extensions/section-ids-extension'
 urls:
   latest_version_segment: ''