Make javadoc <p> style guide compliant

This led to confusion for an open source contributor about how to format
code. We don't want to be like, "do as I say, not as I do."

https://google.github.io/styleguide/javaguide.html#s7.1.2-javadoc-paragraphs
-------------
Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=122589700

java/google/registry/model/domain/allocate/AllocateCreateExtension.java

@@ -25,9 +25,9 @@ import javax.xml.bind.annotation.XmlRootElement;
 /**
  * An XML data object that represents an allocate extension that will be present on EPP commands to
  * allocate a domain from an application.
- * <p>
- * This object holds XML data which JAXB will unmarshal from an EPP domain create command extension.
- * The XML will have the following enclosing structure:
+ *
+ * <p>This object holds XML data which JAXB will unmarshal from an EPP domain create command
+ * extension.  The XML will have the following enclosing structure:
  *
  * <pre> {@code
  *   <epp>