annotation/parameterless annotation

Parameterless annotations aren't necessarily marker annotations.
All we can tell about a use of an annotation is that it's parameterless,
and that's how 4.8.5 is specified.

Related: #360

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Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=286650854

core/src/main/java/com/google/googlejavaformat/java/JavaInputAstVisitor.java

@@ -3546,26 +3546,27 @@ private boolean hasTrailingToken(Input input, List<? extends Tree> nodes, String
 
   /**
    * Can a local with a set of modifiers be declared with horizontal annotations? This is currently
-   * true if there is at most one marker annotation, and no others.
+   * true if there is at most one parameterless annotation, and no others.
    *
    * @param modifiers the list of {@link ModifiersTree}s
    * @return whether the local can be declared with horizontal annotations
    */
   private Direction canLocalHaveHorizontalAnnotations(ModifiersTree modifiers) {
-    int markerAnnotations = 0;
+    int parameterlessAnnotations = 0;
     for (AnnotationTree annotation : modifiers.getAnnotations()) {
       if (annotation.getArguments().isEmpty()) {
-        markerAnnotations++;
+        parameterlessAnnotations++;
       }
     }
-    return markerAnnotations <= 1 && markerAnnotations == modifiers.getAnnotations().size()
+    return parameterlessAnnotations <= 1
+            && parameterlessAnnotations == modifiers.getAnnotations().size()
         ? Direction.HORIZONTAL
         : Direction.VERTICAL;
   }
 
   /**
    * Should a field with a set of modifiers be declared with horizontal annotations? This is
-   * currently true if all annotations are marker annotations.
+   * currently true if all annotations are parameterless annotations.
    */
   private Direction fieldAnnotationDirection(ModifiersTree modifiers) {
     for (AnnotationTree annotation : modifiers.getAnnotations()) {