fix: annotations

Author: aszarama

src/main/java/org/kohsuke/github/GHCommit.java

@@ -243,7 +243,7 @@ public String getSha() {
     public static class Parent {
 
         /** The url. */
-        @SuppressFBWarnings(value = "UUF_UNUSED_FIELD", justification = "We don't provide it in API now")
+        @SuppressFBWarnings(value = "UUF_UNUSED_PUBLIC_OR_PROTECTED_FIELD", justification = "used in backend code")
         public String url;
 
         /** The sha. */