Small inconsistency between creation and retrieval

[LM-SR]

During creation, the example provided reads
https://google.aip.dev/133#request-message

message CreateBookRequest {
 (...)
  // The ID to use for the book, which will become the final component of
  // the book's resource name.
  //
  // This value should be 4-63 characters, and valid characters
  // are /[a-z][0-9]-/.
  string book_id = 2 [(google.api.field_behavior) = REQUIRED];

  // The book to create.
  Book book = 3 [(google.api.field_behavior) = REQUIRED];
}

During retrieval, the example provided reads
https://google.aip.dev/131#request-message

message GetBookRequest {
  // The name of the book to retrieve.
  // Format: publishers/{publisher}/books/{book}
  (...)
}

The information that is requested in the path during retrieval is book_id (and made clear during creation), but the "format" comment states that this should be "book".

A potential simple solution would be to have a note that whenever specifying {book}, this is a reference to {book}_id and not to {book.name}. This would be nicer than replacing the "format" comment from {book} to {book_id}.