GH-971 - Improve compatibility matrix.

Also link to it from the introduction.

Author: odrotbohm

src/docs/antora/modules/ROOT/pages/appendix.adoc

@@ -8,10 +8,14 @@
 [cols="1,1,1,1,1", options="header, unbreakable"]
 |===
 |Spring Modulith Version
-|Spring Boot Version (compiled against)
-|Spring Boot Version (examples tested against)
-|jMolecules (compiled)
-|jMolecules (tested)
+|Spring Boot Version +
+(compiled against)
+|Spring Boot Version +
+(examples tested against)
+|jMolecules +
+(compiled)
+|jMolecules +
+(tested)
 
 |1.4 (snapshot)
 |3.4
@@ -29,13 +33,13 @@
 |3.3
 |3.1, 3.2, 3.3, 3.4
 |2023.1
-|2023.2, 2025.0 RC2
+|2023.1, 2023.2, 2025.0 RC2
 
 |1.1
 |3.2
 |3.1, 3.2, 3.3, 3.4
 |2023.1
-|2023.2, 2025.0 RC2
+|2023.1, 2023.2, 2025.0 RC2
 |===
 
 [appendix]

src/docs/antora/modules/ROOT/pages/index.adoc

@@ -26,6 +26,11 @@ As a result, Spring Modulith enables developers to build applications that are e
 * Snapshot repository: https://repo.spring.io/snapshot
 * Javadoc: https://docs.spring.io/spring-modulith/docs/{projectVersion}/api
 
+[[compatibility]]
+== Spring Boot compatbility
+
+Find a full Spring Boot compatibility matrix xref:appendix.adoc#compatibility-matrix[here].
+
 [[using-spring-modulith]]
 == Using Spring Modulith