chore: renames SuppressFBWarnings to follo best practice

SuppressFBWarnings renamed too SuppressFindBugsWarnings
removes also a last standing checkstyle warning

todolist/fxutil/src/main/java/fxutil/SuppressFBWarnings.java → todolist/fxutil/src/main/java/fxutil/SuppressFindBugsWarnings.java

@@ -8,7 +8,7 @@ import java.lang.annotation.RetentionPolicy;
  * Must have this specific name to be considered by spotbugs.
  */
 @Retention(RetentionPolicy.CLASS)
-public @interface SuppressFBWarnings {
+public @interface SuppressFindBugsWarnings {
   /**
    * The set of FindBugs warnings that are to be suppressed in
    * annotated element. The value can be a bug category, kind or pattern.

todolist/fxutil/src/main/java/fxutil/doc/FileMenuController.java

 package fxutil.doc;
 
-import fxutil.SuppressFBWarnings;
+import fxutil.SuppressFindBugsWarnings;
 import java.io.File;
 import java.io.FileInputStream;
 import java.io.IOException;
@@ -36,7 +36,7 @@ public class FileMenuController {
    *
    * @param documentStorage the document storage
    */
-  @SuppressFBWarnings(
+  @SuppressFindBugsWarnings(
       value = "EI_EXPOSE_REP2", 
       justification = "We intentioanlly don't deep copy documentStorage")
   public void setDocumentStorage(final DocumentStorage<File> documentStorage) {