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/tools/params/DateTimeParameter.java

@@ -35,8 +35,8 @@ public final class DateTimeParameter extends ParameterConverterValidator<DateTim
    * Parser for DateTimes that permits only a restricted subset of ISO 8601 datetime syntax.
    * The supported format is "YYYY-MM-DD'T'HH:MM:SS[.SSS]ZZ", i.e. there must be a complete date
    * and at least hours, minutes, seconds, and time zone; milliseconds are optional.
-   * <p>
-   * We use this instead of the default {@link ISODateTimeFormat#dateTimeParser()} because that
+   *
+   * <p>We use this instead of the default {@link ISODateTimeFormat#dateTimeParser()} because that
    * parser is very flexible and accepts date times with missing dates, missing dates, and various
    * other unspecified fields that can lead to confusion and ambiguity.
    */

java/google/registry/tools/params/LoggingLevelParameter.java

@@ -18,8 +18,8 @@ import java.util.logging.Level;
 
 /**
  * Java logging level CLI parameter converter/validator.
- * <p>
- * If Level were an enum then this wouldn't be needed since JCommander has built-in conversion
+ *
+ * <p>If Level were an enum then this wouldn't be needed since JCommander has built-in conversion
  * support for enums, but Level is actually just a regular class with some static instances.
  */
 public final class LoggingLevelParameter extends ParameterConverterValidator<Level> {

java/google/registry/tools/params/TransitionListParameter.java

@@ -30,15 +30,16 @@ import java.util.Map;
 
 /**
  * Combined converter and validator class for transition list JCommander argument strings.
- * <p>
- * These strings have the form {@code <DateTime>=<T-str>,[<DateTime>=<T-str>]*} where
- * {@code <T-str>} is a string that can be parsed into an instance of some value type {@code T},
- * and the entire argument represents a series of timed transitions of some property taking on
- * those values.  This class converts such a string into an ImmutableSortedMap mapping DateTime to
- * {@code T}.  Validation and conversion share the same logic; validation is just done by attempting
+ *
+ * <p>These strings have the form {@code <DateTime>=<T-str>,[<DateTime>=<T-str>]*} where
+ * {@code <T-str>} is a string that can be parsed into an instance of some value type {@code T}, and
+ * the entire argument represents a series of timed transitions of some property taking on those
+ * values. This class converts such a string into an ImmutableSortedMap mapping DateTime to
+ * {@code T}. Validation and conversion share the same logic; validation is just done by attempting
  * conversion and throwing exceptions if need be.
- * <p>
- * Subclasses must implement parseValue() to define how to parse {@code <T-str>} into a {@code T}.
+ *
+ * <p>Subclasses must implement parseValue() to define how to parse {@code <T-str>} into a
+ * {@code T}.
  *
  * @param <T> instance value type
  */