Minor Markdown consistency cleanup. (#24605)

docs/4.0/components/breadcrumb.md

@@ -10,7 +10,6 @@ group: components
 Separators are automatically added in CSS through [`::before`](https://developer.mozilla.org/en-US/docs/Web/CSS/::before) and [`content`](https://developer.mozilla.org/en-US/docs/Web/CSS/content).
 
 {% example html %}
-
 <nav aria-label="breadcrumb" role="navigation">
   <ol class="breadcrumb">
     <li class="breadcrumb-item active" aria-current="page">Home</li>

docs/4.0/components/navbar.md

@@ -14,7 +14,7 @@ Here's what you need to know before getting started with the navbar:
 - Navbars and their contents are fluid by default. Use [optional containers](#containers) to limit their horizontal width.
 - Use our [spacing]({{ site.baseurl }}/docs/{{ site.docs_version }}/utilities/spacing/) and [flex]({{ site.baseurl }}/docs/{{ site.docs_version }}/utilities/flex/) utility classes for controlling spacing and alignment within navbars.
 - Navbars are responsive by default, but you can easily modify them to change that. Responsive behavior depends on our Collapse JavaScript plugin.
-- Navbars are hidden by default when printing. Force them to be printed by adding `.d-print` to the `.navbar`. See the [display]({{ site.baseurl }}/docs/{{ site.docs_version }}/utilities/display/) utility class. 
+- Navbars are hidden by default when printing. Force them to be printed by adding `.d-print` to the `.navbar`. See the [display]({{ site.baseurl }}/docs/{{ site.docs_version }}/utilities/display/) utility class.
 - Ensure accessibility by using a `<nav>` element or, if using a more generic element such as a `<div>`, add a `role="navigation"` to every navbar to explicitly identify it as a landmark region for users of assistive technologies.
 
 Read on for an example and list of supported sub-components.