more renaming to align with the new name.

git-svn-id: https://hudson.dev.java.net/svn/hudson/trunk/hudson/main@9417 71c3de6d-444a-0410-be80-ed276b4c234a

core/src/main/java/hudson/Functions.java

@@ -498,7 +498,7 @@ public class Functions {
         return ComputerLauncher.LIST;
     }
 
-    public static List<Descriptor<RetentionStrategy<?>>> getSlaveAvailabilityStrategyDescriptors() {
+    public static List<Descriptor<RetentionStrategy<?>>> getRetentionStrategyDescriptors() {
         return RetentionStrategy.LIST;
     }