Update introduction.adoc

Author: rhusar

docs/src/main/asciidoc/introduction.adoc

@@ -36,18 +36,18 @@ the former name mod_cluster is currently used for container implementation.
 |===
 | Release | Tomcat versions | Code | Documentation
 
-| `1.4` |  `9.0`, `8.5` (EOL), `8.0` (EOL), `7.0` (EOL) | https://github.com/modcluster/mod_cluster/tree/1.4.x[SCM Branch] | https://docs.modcluster.io/apidocs/1.4/[Javadoc]
+| `2.1` (in development) | `11.0`, `10.1`, `9.0` | https://github.com/modcluster/mod_cluster/tree/main[SCM Branch] | https://docs.modcluster.io/apidocs/2.1/[Javadoc]
 | `2.0` | `10.1`, `9.0`, `8.5` (EOL) | https://github.com/modcluster/mod_cluster/tree/2.0.x[SCM Branch] | https://docs.modcluster.io/apidocs/2.0/[Javadoc]
-| `2.1` (in development) | `11.0`, `10.1`, `9.0` | https://github.com/modcluster/mod_cluster/tree/main[SCM Branch] |
+| `1.4` |  `9.0`, `8.5` (EOL), `8.0` (EOL), `7.0` (EOL) | https://github.com/modcluster/mod_cluster/tree/1.4.x[SCM Branch] | https://docs.modcluster.io/apidocs/1.4/[Javadoc]
 |===
 
 === Apache HTTP modules
 
 |===
 | Release | httpd versions | Code | Documentation
 
-| `1.3` | 2.4.49 and newer | https://github.com/modcluster/mod_cluster/tree/1.3.x[SCM Branch] |
 | `2.0` (in development) | 2.4.53 and newer | https://github.com/modcluster/mod_proxy_cluster/tree/main[SCM Branch] | https://docs.modcluster.io/apidocs/mpc-2.0/[Doxygen]
+| `1.3` | 2.4.49 and newer | https://github.com/modcluster/mod_cluster/tree/1.3.x[SCM Branch] |
 |===
 
 Complete documentation for legacy versions is archived at https://docs.modcluster.io/legacy/.