broken links in java.util.logging

A link checker has detected a couple of problems in SimpleFormatter. These are shown here:

$ find open/src -name SimpleFormatter.java | xargs grep '\.\./Formatter' /dev/null
open/src/java.logging/share/classes/java/util/logging/SimpleFormatter.java: * <a href="../Formatter.html#syntax">format string</a>
open/src/java.logging/share/classes/java/util/logging/SimpleFormatter.java: * <a href="../Formatter.html#syntax">format string</a>

In both cases, Formatter is in the same directory, and so should not use `../` in the link.