code: public T removeModule(final String moduleName, final String slot, final byte[] existingHash) {
          final ContentItem item = createModuleItem(moduleName, slot, NO_CONTENT);
          addContentModification(createContentModification(item, ModificationType.REMOVE, existingHash));
          return returnThis();
      }
docs: Remove a module.
  
  @param moduleName the module name
  @param slot the module slot
  @param existingHash the existing hash
  @return the builder