[Docs] simplify versions matrix

spring-pulsar-docs/src/main/asciidoc/attributes-variables.adoc

@@ -10,11 +10,13 @@
 
 :github: https://github.com/spring-projects/spring-pulsar
 :javadocs: https://docs.spring.io/spring-pulsar/docs/{spring-pulsar-version}/api
+:spring-framework-docs: https://spring.io/projects/spring-framework#learn
 :spring-boot-docs: https://docs.spring.io/spring-boot/docs/{spring-boot-version}/reference/htmlsingle
 :spring-boot-pulsar-config-props: {spring-boot-docs}/#application-properties.integration
 :spring-cloud-stream-docs: https://docs.spring.io/spring-cloud-stream/docs/{spring-cloud-stream-version}/reference/html/
 :spring-cloud-function: https://spring.io/projects/spring-cloud-function
 
 :apache-pulsar-docs: https://pulsar.apache.org/docs/3.0.x
+:apache-pulsar-cient-docs: {apache-pulsar-docs}/client-libraries-java
 :apache-pulsar-io-docs: {apache-pulsar-docs}/io-connectors
 :apache-pulsar-function-docs: {apache-pulsar-docs}/functions-overview

spring-pulsar-docs/src/main/asciidoc/intro.adoc

@@ -1,3 +1,6 @@
+
+include::attributes-variables.adoc[]
+
 = Introduction
 This project provides a basic Spring-friendly API for developing https://pulsar.apache.org/[Apache Pulsar] applications.
 
@@ -6,42 +9,24 @@ In addition, it also provides various convenience APIs for Spring developers to
 
 include::project-state.adoc[leveloffset=+1]
 
-== Supported Versions
+== System Requirements
 
-The supported versions for the underlying libraries required by the framework are as follows:
-|===
-| Library | Minimum Version | Version Used
+Spring Pulsar `{spring-pulsar-version}` requires the following:
 
-| Apache Pulsar
-| 3.0.0
-| {pulsar-client-version}
+- https://www.java.com[Java 17] and is compatible up to and including Java 20
+- {spring-framework-docs}[Spring Framework `{spring-framework-version}`] or above
+- {apache-pulsar-cient-docs}/[Apache Pulsar Java Client `{pulsar-client-version}`] or above
 
-| Spring Framework
-| 6.0.9
-| {spring-framework-version}
-
-| Spring Boot
-| 3.2.0
-| {spring-boot-version}
-
-| Java
-| 17
-| -
-
-| Gradle
-| 7.4
-| -
-
-|===
-
-NOTE: The **Version Used** is the version of the library targeted by Spring Pulsar  {spring-pulsar-version} (the version of the framework this reference guide belongs to).
-
-Details for other versions and compatibility can be found in the <<version-compatibility.adoc#appendix.version-compatibility,appendix>>.
+====
+The version compatibility matrix (including Spring Boot) can be found in the <<version-compatibility.adoc#appendix.version-compatibility,appendix>>.
+====
 
 == Building the Project
 If you have cloned the project locally, follow these steps to build the project from the source code.
 
-Spring for Apache Pulsar uses Gradle as its build tool. Run the following command to do a full build of the project:
+NOTE: Gradle `7.x (7.4 or above)` is required to build.
+
+Run the following command to do a full build of the project:
 [indent=0]
 ----
 ./gradlew clean build