Fix "no comment" warnings in java.logging

src/java.logging/share/classes/java/util/logging/Level.java:439: warning: no comment
    private Object readResolve() {
                   ^
src/java.logging/share/classes/java/util/logging/LogRecord.java:652: warning: no @param for in
    private void readObject(ObjectInputStream in)
                 ^
src/java.logging/share/classes/java/util/logging/LogRecord.java:652: warning: no @throws for java.io.IOException
    private void readObject(ObjectInputStream in)
                 ^
src/java.logging/share/classes/java/util/logging/LogRecord.java:652: warning: no @throws for java.lang.ClassNotFoundException
    private void readObject(ObjectInputStream in)
                 ^
src/java.logging/share/classes/java/util/logging/LogRecord.java:604: warning: no @param for out
    private void writeObject(ObjectOutputStream out) throws IOException {
                 ^
src/java.logging/share/classes/java/util/logging/LogRecord.java:604: warning: no @throws for java.io.IOException
    private void writeObject(ObjectOutputStream out) throws IOException {
                 ^
6 warnings