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/eppcommon/package-info.java

@@ -14,8 +14,8 @@
 
 /**
  * Domain Registry datastore model common/shared classes.
- * <p>
- * This package is intended to hold classes which are shared across multiple XML namespaces. As
+ *
+ * <p>This package is intended to hold classes which are shared across multiple XML namespaces. As
  * such, no default namespace is declared in this package, and all objects in this package should be
  * declared XmlTransient.
  */