code: public void deletePage(Object projectIdOrPath, String slug) throws GitLabApiException {
          delete(Response.Status.NO_CONTENT, null, "projects", getProjectIdOrPath(projectIdOrPath), "wikis", slug);
      }
docs: Deletes an existing project wiki page. This is an idempotent function and deleting a non-existent page does
  not cause an error.
  
  <pre><code>GitLab Endpoint: DELETE /projects/:id/wikis/:slug</code></pre>
  
  @param projectIdOrPath the project in the form of an Integer(ID), String(path), or Project instance
  @param slug the slug of the project's wiki page
  @throws GitLabApiException if any exception occurs