code: public void unprotectBranch(Integer projectIdOrPath, String branchName) throws GitLabApiException {
          delete(Response.Status.NO_CONTENT, null, "projects", getProjectIdOrPath(projectIdOrPath), "protected_branches", urlEncode(branchName));
      }
docs: Unprotects the given protected branch or wildcard protected branch.
  
  <pre><code>GitLab Endpoint: DELETE /projects/:id/protected_branches/:name</code></pre>
  
  @param projectIdOrPath the project in the form of an Integer(ID), String(path), or Project instance
  @param branchName the name of the branch to un-protect
  @throws GitLabApiException if any exception occurs