API: Fix javadoc of ManageSnapshots.setMaxRefAgeMs (apache#15642)

Author: ebyhr

api/src/main/java/org/apache/iceberg/ManageSnapshots.java

@@ -207,10 +207,10 @@ default ManageSnapshots createBranch(String name) {
   ManageSnapshots setMaxSnapshotAgeMs(String branchName, long maxSnapshotAgeMs);
 
   /**
-   * Updates the retention policy for a reference.
+   * Updates the retention policy for a reference. The reference can be a branch or a tag.
    *
-   * @param name branch name
-   * @param maxRefAgeMs retention age in milliseconds of the tag reference itself
+   * @param name branch or tag name
+   * @param maxRefAgeMs retention age in milliseconds of the reference itself
    * @return this for method chaining
    * @throws IllegalArgumentException if the reference does not exist
    */