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/launch/LaunchPhase.java

@@ -34,8 +34,8 @@ import javax.xml.bind.annotation.XmlValue;
 
 /**
  * The launch phase of the TLD being addressed by this command.
- * <p>
- * The launch phase refers to the various stages that a TLD goes through before entering general
+ *
+ * <p>The launch phase refers to the various stages that a TLD goes through before entering general
  * availability. The various phases are described below (in order that they usually occur).
  */
 @Embed