code: public Response removeAttachment(String id, String rev, String attachmentName) {
          assertNotEmpty(id, "id");
          assertNotEmpty(rev, "rev");
          assertNotEmpty(attachmentName, "attachmentName");
          final URI uri = new DatabaseURIHelper(dbUri).attachmentUri(id, rev, attachmentName);
          return couchDbClient.delete(uri);
      }
docs: Removes an attachment from a document given both a document <code>_id</code> and
  <code>_rev</code> and <code>attachmentName</code> values.
  
  @param id  The document _id field.
  @param rev The document _rev field.
  @param attachmentName The document attachment field.
  @return {@link Response}
  @throws NoDocumentException If the document is not found in the database.
  @throws DocumentConflictException If a conflict is found during attachment removal.