Remove custom example plugin. (#25784)

docs/4.0/utilities/flex.md

@@ -10,13 +10,15 @@ toc: true
 
 Apply `display` utilities to create a flexbox container and transform **direct children elements** into flex items. Flex containers and items are able to be modified further with additional flex properties.
 
-{% example html %}
+{% capture example %}
 <div class="d-flex p-2 bd-highlight">I'm a flexbox container!</div>
-{% endexample %}
+{% endcapture %}
+{% include example.html content=example %}
 
-{% example html %}
+{% capture example %}
 <div class="d-inline-flex p-2 bd-highlight">I'm an inline flexbox container!</div>
-{% endexample %}
+{% endcapture %}
+{% include example.html content=example %}
 
 Responsive variations also exist for `.d-flex` and `.d-inline-flex`.
 
@@ -30,7 +32,7 @@ Set the direction of flex items in a flex container with direction utilities. In
 
 Use `.flex-row` to set a horizontal direction (the browser default), or `.flex-row-reverse` to start the horizontal direction from the opposite side.
 
-{% example html %}
+{% capture example %}
 <div class="d-flex flex-row bd-highlight mb-3">
   <div class="p-2 bd-highlight">Flex item 1</div>
   <div class="p-2 bd-highlight">Flex item 2</div>
@@ -41,11 +43,12 @@ Use `.flex-row` to set a horizontal direction (the browser default), or `.flex-r
   <div class="p-2 bd-highlight">Flex item 2</div>
   <div class="p-2 bd-highlight">Flex item 3</div>
 </div>
-{% endexample %}
+{% endcapture %}
+{% include example.html content=example %}
 
 Use `.flex-column` to set a vertical direction, or `.flex-column-reverse`  to start the vertical direction from the opposite side.
 
-{% example html %}
+{% capture example %}
 <div class="d-flex flex-column bd-highlight mb-3">
   <div class="p-2 bd-highlight">Flex item 1</div>
   <div class="p-2 bd-highlight">Flex item 2</div>
@@ -56,7 +59,8 @@ Use `.flex-column` to set a vertical direction, or `.flex-column-reverse`  to st
   <div class="p-2 bd-highlight">Flex item 2</div>
   <div class="p-2 bd-highlight">Flex item 3</div>
 </div>
-{% endexample %}
+{% endcapture %}
+{% include example.html content=example %}
 
 Responsive variations also exist for `flex-direction`.
 
@@ -217,13 +221,14 @@ Responsive variations also exist for `align-self`.
 
 Use the `.flex-fill` class on a series of sibling elements to force them into equal widths while taking up all available horizontal space. [Especially useful for equal-width, or justified, navigation.]({{ site.baseurl }}/docs/{{ site.docs_version }}/components/navs/#working-with-flex-utilities)
 
-{% example html %}
+{% capture example %}
 <div class="d-flex bd-highlight">
   <div class="p-2 flex-fill bd-highlight">Flex item</div>
   <div class="p-2 flex-fill bd-highlight">Flex item</div>
   <div class="p-2 flex-fill bd-highlight">Flex item</div>
 </div>
-{% endexample %}
+{% endcapture %}
+{% include example.html content=example %}
 
 Responsive variations also exist for `flex-fill`.
 
@@ -236,7 +241,7 @@ Flexbox can do some pretty awesome things when you mix flex alignments with auto
 
 **Unfortunately, IE10 and IE11 do not properly support auto margins on flex items whose parent has a non-default `justify-content` value.** [See this StackOverflow answer](https://stackoverflow.com/a/37535548) for more details.
 
-{% example html %}
+{% capture example %}
 <div class="d-flex bd-highlight mb-3">
   <div class="p-2 bd-highlight">Flex item</div>
   <div class="p-2 bd-highlight">Flex item</div>
@@ -254,13 +259,14 @@ Flexbox can do some pretty awesome things when you mix flex alignments with auto
   <div class="p-2 bd-highlight">Flex item</div>
   <div class="ml-auto p-2 bd-highlight">Flex item</div>
 </div>
-{% endexample %}
+{% endcapture %}
+{% include example.html content=example %}
 
 ### With align-items
 
 Vertically move one flex item to the top or bottom of a container by mixing `align-items`, `flex-direction: column`, and `margin-top: auto` or `margin-bottom: auto`.
 
-{% example html %}
+{% capture example %}
 <div class="d-flex align-items-start flex-column bd-highlight mb-3" style="height: 200px;">
   <div class="mb-auto p-2 bd-highlight">Flex item</div>
   <div class="p-2 bd-highlight">Flex item</div>
@@ -272,7 +278,8 @@ Vertically move one flex item to the top or bottom of a container by mixing `ali
   <div class="p-2 bd-highlight">Flex item</div>
   <div class="mt-auto p-2 bd-highlight">Flex item</div>
 </div>
-{% endexample %}
+{% endcapture %}
+{% include example.html content=example %}
 
 ## Wrap
 
@@ -358,13 +365,14 @@ Responsive variations also exist for `flex-wrap`.
 
 Change the _visual_ order of specific flex items with a handful of `order` utilities. We only provide options for making an item first or last, as well as a reset to use the DOM order. As `order` takes any integer value (e.g., `5`), add custom CSS for any additional values needed.
 
-{% example html %}
+{% capture example %}
 <div class="d-flex flex-nowrap bd-highlight">
   <div class="order-3 p-2 bd-highlight">First flex item</div>
   <div class="order-2 p-2 bd-highlight">Second flex item</div>
   <div class="order-1 p-2 bd-highlight">Third flex item</div>
 </div>
-{% endexample %}
+{% endcapture %}
+{% include example.html content=example %}
 
 Responsive variations also exist for `order`.