Fix Issue 18761 - Use HTML to force a newline for DDox's macro processor

Author: wilzbach

dlang.org.ddoc

@@ -386,7 +386,9 @@ _=
 RELATIVE_LINK2=$(ALOCAL $1, $+)
 _=
 
-RUNNABLE_EXAMPLE=$(DIVC runnable-examples, $1)
+RUNNABLE_EXAMPLE=<div class="runnable-examples">
+$1
+</div>
 RUNNABLE_EXAMPLE_STDIN=<code class="runnable-examples-stdin">$0</code>
 RUNNABLE_EXAMPLE_ARGS=<code class="runnable-examples-args">$0</code>