docs: warn about possible lost of customization

meleu

2022-04-04 3583265f80afa081bf7a1fe996a9b3fe3c4e32e0

 layouts/_default/single.html

@@ -24,8 +24,10 @@
      </ul>
      {{ if (and $.Site.Data.config.enableToc (ne .Params.enableToc false)) }}
      <aside class="mainTOC">
          <h3>Table of Contents</h3>
          {{ .TableOfContents }}
          <details {{ if $.Site.Data.config.openToc }}open {{ end }}>
            <summary>Table of Contents</summary>
            {{ .TableOfContents }}
          </details>
      </aside>
      {{end}}
      {{partial "textprocessing.html" . }}