Document Java toolchains.

Closes #12672.

PiperOrigin-RevId: 348045516
diff --git a/site/docs/tutorial/java.md b/site/docs/tutorial/java.md
index c7b8cb3..de97c46 100644
--- a/site/docs/tutorial/java.md
+++ b/site/docs/tutorial/java.md
@@ -31,7 +31,7 @@
 
 ### Install the JDK
 
-1.  Install Java 8 JDK.
+1.  Install Java JDK (preferred version is 11, however versions between 8 and 15 are supported).
 
 2.  Set the JAVA\_HOME environment variable to point to the JDK.
     *   On Linux/macOS: