Add additional wording to the Introduction section of Bootstrap docs …

…about the bootstrap bundle js (#26688)

docs/4.1/getting-started/introduction.md

@@ -37,6 +37,8 @@ We use [jQuery's slim build](https://blog.jquery.com/2016/06/09/jquery-3-0-final
 
 Curious which components explicitly require jQuery, our JS, and Popper.js? Click the show components link below. If you're at all unsure about the general page structure, keep reading for an example page template.
 
+Our `bootstrap.bundle.js` and `bootstrap.bundle.min.js` include [Popper](https://popper.js.org/), but not [jQuery](https://jquery.com/). For more information about what's included in Bootstrap, please see our [contents]({{ site.baseurl }}/docs/{{ site.docs_version }}/getting-started/contents/#precompiled-bootstrap) section.
+
 <details>
 <summary class="text-primary mb-3">Show components requiring JavaScript</summary>
 {% capture markdown %}