$ cat config.xml 
<?xml version="1.0"?>
<!DOCTYPE module PUBLIC
          "-//Puppy Crawl//DTD Check Configuration 1.3//EN"
          "https://checkstyle.org/dtds/configuration_1_3.dtd">
<module name="Checker">
  <module name="TreeWalker">
    <module name="JavadocParagraph"/>
  </module>
</module>

$ cat Test.java
/**
 * Some Summary.
 *
 * <p><strong>1.2 <code>offset_table</code> structure</strong><p>
 */
public class Test {
}

$ java -jar checkstyle-10.18.1-all.jar -c config.xml Test.java 
Starting audit...
[ERROR] /var/tmp/Test.java:4: <p> tag should be placed immediately before the first word,
          with no space after. [JavadocParagraph]
Audit done.
Checkstyle ends with 1 errors.