Remove unused afnote-block spans from anywhere-footnotes example for cleaner HTML structure.

Author: RayOffiah

test/fixtures/antora-output/extensions-anywhere-footnotes.html

@@ -145,8 +145,7 @@ <h1 class="page">Anywhere Footnotes</h1>
 <h2 id="first-block-of-footnotes"><a class="anchor" href="#first-block-of-footnotes"></a>First block of footnotes</h2>
 <div class="sectionbody">
 <div class="paragraph">
-<p><span class="afnote-block"><a id="afnote-first-block"></a>
-</span></p><div class="paragraph afnote-hr-divider">
+<p></p><div class="paragraph afnote-hr-divider">
 <p></p>
 </div>
 <div class="dlist afnote-horizontal">
@@ -168,8 +167,7 @@ <h2 id="first-block-of-footnotes"><a class="anchor" href="#first-block-of-footno
 <h2 id="second-block-of-footnotes"><a class="anchor" href="#second-block-of-footnotes"></a>Second block of footnotes</h2>
 <div class="sectionbody">
 <div class="paragraph">
-<p><span class="afnote-block"><a id="afnote-second-block"></a>
-</span></p><div class="paragraph afnote-hr-divider">
+<p></p><div class="paragraph afnote-hr-divider">
 <p></p>
 </div>
 <div class="dlist afnote-horizontal">
@@ -215,11 +213,10 @@ <h2 id="second-block-of-footnotes"><a class="anchor" href="#second-block-of-foot
 <td class="tableblock halign-left valign-top"><p class="tableblock">Limited</p></td>
 </tr>
 <tr>
-<td class="tableblock halign-left valign-top" colspan="4"><p class="tableblock"><span class="afnote-block"><a id="afnote-mid-block"></a>
+<td class="tableblock halign-left valign-top" colspan="4"><p class="tableblock">
 
 
-
-</span></p><div class="dlist afnote-horizontal">
+</p><div class="dlist afnote-horizontal">
 <dl>
 <dt class="hdlist1"><a id="afnote-mid-block-5-def"></a><a href="#afnote-mid-block-5-ref" class="afnote-marker">5</a></dt>
 <dd>