Fix javadoc error related to @param in TimedHashMap.java (1.8)

[robert-scheck]

When building using OpenJDK Java 17, I run into the following javadoc error related to @param in TimedHashMap.java which should be fixed:

IcedTea-Web-icedtea-web-1.8.8/netx/net/sourceforge/jnlp/util/TimedHashMap.java:60: error: invalid use of @param
 * @param K The key type
   ^
IcedTea-Web-icedtea-web-1.8.8/netx/net/sourceforge/jnlp/util/TimedHashMap.java:61: error: invalid use of @param
 * @param V The Object type
   ^

[robert-scheck]

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