(doc) Fix XML formatting
diff --git a/src/site/apt/examples/filter.apt b/src/site/apt/examples/filter.apt
index 38eaf56..b42b746 100644
--- a/src/site/apt/examples/filter.apt
+++ b/src/site/apt/examples/filter.apt
@@ -75,12 +75,14 @@
However, if we add a <<<\<filtering\>>>> tag to our POM and set it to <<<true>>> like this:
+-----+
+<project>
...
<resource>
<directory>src/main/resources</directory>
<filtering>true</filtering>
</resource>
...
+</project>
+-----+
Our <<<target/classes/hello.txt>>> after calling
@@ -158,11 +160,13 @@
and adding that to our POM
+-----+
+<project>
...
<filters>
<filter>my-filter-values.properties</filter>
</filters>
...
+</project>
+-----+
