archlinux-java: fix documentation link, update page (#10433)

pages/linux/archlinux-java.md

@@ -1,12 +1,16 @@
 # archlinux-java
 
-> A helper script that provides functionalities for Java environments.
-> More information: <https://github.com/michaellass/archlinux-java-run>.
+> Switch between installed Java environments.
+> More information: <https://wiki.archlinux.org/title/Java#Switching_between_JVM>.
 
 - List installed Java environments:
 
 `archlinux-java status`
 
+- Return the short name of the current default Java environment:
+
+`archlinux-java get`
+
 - Set the default Java environment:
 
 `archlinux-java set {{java_environment}}`
@@ -15,6 +19,6 @@
 
 `archlinux-java unset`
 
-- Set the default Java environment automatically:
+- Fix an invalid/broken default Java environment configuration:
 
 `archlinux-java fix`