docs: protected static IndexedContainer getSSLModeContainer(
          String captionProp,
          boolean includeOldStyle,
          CmsSSLMode currentValue) {
  
          IndexedContainer res = new IndexedContainer();
          res.addContainerProperty(captionProp, String.class, "");
          boolean isLetsEncrypt = currentValue == CmsSSLMode.LETS_ENCRYPT;
          boolean letsEncryptConfigured = (OpenCms.getLetsEncryptConfig() != null)
              && OpenCms.getLetsEncryptConfig().isValidAndEnabled();
          boolean skipLetsEncrypt = !letsEncryptConfigured && !isLetsEncrypt;
  
          for (CmsSSLMode mode : CmsSSLMode.availableModes(includeOldStyle, !skipLetsEncrypt)) {
              Item item = res.addItem(mode);
              item.getItemProperty(captionProp).setValue(mode.getLocalizedMessage());
          }
          return res;
      }