docs: update bulk update bruno docs with normalization examples

Update Bulk Update Books.bru to demonstrate tag and contributor updates:
- Add tags update example with normalized output
- Add contributors update example
- Shows punctuation preference behavior

Demonstrates that tags and contributors are automatically normalized
when updated via bulk operations, ensuring consistency across the database.

Relates to Tags & Contributors Migration documentation updates

bruno/books/Bulk Update Books.bru

@@ -35,13 +35,15 @@
            "book_id": "{{bookId1}}",
            "updates": {
              "title": "Updated Title",
-            "genre": "Science Fiction"
+             "genre": "Science Fiction",
+             "tags": ["science fiction", "non-fiction", "ACME CORP."]
            }
          },
          {
            "book_id": "{{bookId2}}",
            "updates": {
-            "author": "Updated Author"
+             "author": "Updated Author",
+             "contributors": ["O'Reilly Media", "Penguin Random House"]
            }
          }
        ]