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/flows/Flow.java

@@ -34,8 +34,9 @@ import java.util.Set;
 
 /**
  * An abstract EPP flow.
- * <p>
- * This class also contains static methods for loading an appropriate flow based on model classes.
+ *
+ * <p>This class also contains static methods for loading an appropriate flow based on model
+ * classes.
  */
 public abstract class Flow {