add a comment about syncing alternative group names between modules

Signed-off-by: Jonathan Dowland <[email protected]>

Author: jmtd

modules/singleton-jdk/configure.sh

@@ -15,7 +15,9 @@ fi
 # our stated JAVA_VERSION-JAVA_VENDOR (e.g.: 11-openjdk; 1.8.0-openj9)
 rpm -e --nodeps $(rpm -qa java-* | grep -v "^java-${JAVA_VERSION}-${JAVA_VENDOR}")
 
-# workaround for https://issues.redhat.com/browse/RHEL-3437
+# workaround for <https://issues.redhat.com/browse/RHEL-3437>
+# The alternative link groups touched here need to match up with those set in
+# modules/jdk/*/configure.sh
 _arch="$(uname -m)"
 for alt in java javac java_sdk_openjdk jre_openjdk; do
   alternatives --set "$alt" "java-${JAVA_VERSION}-${JAVA_VENDOR}.${_arch}"