8354447: Missing test for retroactive @SuppressWarnings("dangling-doc-comments") behavior

Backport-of: 0e725c6fb1f324b0fd17d206806b4104dc7ba767

Author: Hari Prasad Kummari

test/langtools/tools/javac/danglingDocComments/DanglingDocCommentsClass.java

@@ -45,4 +45,13 @@ public void m4b() { }
         /** Good comment. */
         int i = 0;
     }
-}
+
+    /** Dangling comment X */
+
+    /**
+     * The {@code @SuppressWarnings} annotation below retroactively
+     * silences the warning about "Dangling comment X".
+     */
+    @SuppressWarnings("dangling-doc-comments")
+    public void m5() { }
+}